Error installing

[servusdei2018]

~# pip3 install gitsome
Collecting gitsome
  Using cached https://www.piwheels.org/simple/gitsome/gitsome-0.8.4-py3-none-any.whl
Requirement already satisfied: requests<3.0.0,>=2.8.1 in /usr/lib/python3/dist-packages (from gitsome)
Requirement already satisfied: click<7.0,>=5.1 in /usr/lib/python3/dist-packages (from gitsome)
Collecting pytz<2017.0,>=2016.3 (from gitsome)
  Using cached https://files.pythonhosted.org/packages/f5/fa/4a9aefc206aa49a4b5e0a72f013df1f471b4714cdbe6d78f0134feeeecdb/pytz-2016.10-py2.py3-none-any.whl
Collecting ply<4.0,>=3.4 (from gitsome)
  Using cached https://files.pythonhosted.org/packages/a3/58/35da89ee790598a0700ea49b2a66594140f44dec458c07e8e3d4979137fc/ply-3.11-py2.py3-none-any.whl
Requirement already satisfied: pygments<3.0.0,>=2.0.2 in /usr/lib/python3/dist-packages (from gitsome)
Collecting docopt<1.0.0,>=0.6.2 (from gitsome)
  Using cached https://www.piwheels.org/simple/docopt/docopt-0.6.2-py2.py3-none-any.whl
Collecting uritemplate.py<4.0.0,>=1.0.0 (from gitsome)
  Using cached https://files.pythonhosted.org/packages/8b/ba/6cbb9c3bf4f53997d8d1f69414fc7962f536ba43d283f0e32de68534f6a4/uritemplate.py-3.0.2-py2.py3-none-any.whl
Collecting numpydoc<1.0,>=0.5 (from gitsome)
  Using cached https://www.piwheels.org/simple/numpydoc/numpydoc-0.9.1-py3-none-any.whl
Requirement already satisfied: colorama<1.0.0,>=0.3.3 in /usr/lib/python3/dist-packages (from gitsome)
Collecting prompt-toolkit<2.1.0,>=2.0.0 (from gitsome)
  Using cached https://files.pythonhosted.org/packages/87/61/2dfea88583d5454e3a64f9308a686071d58d59a55db638268a6413e1eb6d/prompt_toolkit-2.0.10-py3-none-any.whl
Collecting feedparser<6.0.0,>=5.2.1 (from gitsome)
  Using cached https://www.piwheels.org/simple/feedparser/feedparser-5.2.1-py3-none-any.whl
Collecting uritemplate>=2.0 (from uritemplate.py<4.0.0,>=1.0.0->gitsome)
  Using cached https://files.pythonhosted.org/packages/e5/7d/9d5a640c4f8bf2c8b1afc015e9a9d8de32e13c9016dcc4b0ec03481fb396/uritemplate-3.0.0-py2.py3-none-any.whl
Collecting sphinx>=1.6.5 (from numpydoc<1.0,>=0.5->gitsome)
  Using cached https://files.pythonhosted.org/packages/1d/58/a547b02946af1cf337c701cafcf3267065c1c83d6e701f540961f4907b5d/Sphinx-2.2.1-py3-none-any.whl
Requirement already satisfied: Jinja2>=2.3 in /usr/lib/python3/dist-packages (from numpydoc<1.0,>=0.5->gitsome)
Collecting wcwidth (from prompt-toolkit<2.1.0,>=2.0.0->gitsome)
  Using cached https://files.pythonhosted.org/packages/7e/9f/526a6947247599b084ee5232e4f9190a38f398d7300d866af3ab571a5bfe/wcwidth-0.1.7-py2.py3-none-any.whl
Requirement already satisfied: six>=1.9.0 in /usr/lib/python3/dist-packages (from prompt-toolkit<2.1.0,>=2.0.0->gitsome)
Collecting babel!=2.0,>=1.3 (from sphinx>=1.6.5->numpydoc<1.0,>=0.5->gitsome)
  Downloading https://files.pythonhosted.org/packages/2c/60/f2af68eb046c5de5b1fe6dd4743bf42c074f7141fe7b2737d3061533b093/Babel-2.7.0-py2.py3-none-any.whl (8.4MB)
    100% |████████████████████████████████| 8.4MB 36kB/s 
Collecting sphinxcontrib-devhelp (from sphinx>=1.6.5->numpydoc<1.0,>=0.5->gitsome)
  Downloading https://files.pythonhosted.org/packages/b0/a3/fea98741f0b2f2902fbf6c35c8e91b22cd0dd13387291e81d457f9a93066/sphinxcontrib_devhelp-1.0.1-py2.py3-none-any.whl (84kB)
    100% |████████████████████████████████| 92kB 1.9MB/s 
Collecting imagesize (from sphinx>=1.6.5->numpydoc<1.0,>=0.5->gitsome)
  Downloading https://files.pythonhosted.org/packages/fc/b6/aef66b4c52a6ad6ac18cf6ebc5731ed06d8c9ae4d3b2d9951f261150be67/imagesize-1.1.0-py2.py3-none-any.whl
Collecting sphinxcontrib-serializinghtml (from sphinx>=1.6.5->numpydoc<1.0,>=0.5->gitsome)
  Downloading https://files.pythonhosted.org/packages/57/b3/3648e48fa5682e61e9839d62de4e23af1795ceb738d68d73bd974257a95c/sphinxcontrib_serializinghtml-1.1.3-py2.py3-none-any.whl (89kB)
    100% |████████████████████████████████| 92kB 2.1MB/s 
Requirement already satisfied: setuptools in /usr/lib/python3/dist-packages (from sphinx>=1.6.5->numpydoc<1.0,>=0.5->gitsome)
Collecting packaging (from sphinx>=1.6.5->numpydoc<1.0,>=0.5->gitsome)
  Downloading https://files.pythonhosted.org/packages/cf/94/9672c2d4b126e74c4496c6b3c58a8b51d6419267be9e70660ba23374c875/packaging-19.2-py2.py3-none-any.whl
Collecting snowballstemmer>=1.1 (from sphinx>=1.6.5->numpydoc<1.0,>=0.5->gitsome)
Exception:
Traceback (most recent call last):
  File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py", line 594, in urlopen
    chunked=chunked)
  File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py", line 391, in _make_request
    six.raise_from(e, None)
  File "<string>", line 2, in raise_from
  File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py", line 387, in _make_request
    httplib_response = conn.getresponse()
  File "/usr/lib/python3.5/http/client.py", line 1198, in getresponse
    response.begin()
  File "/usr/lib/python3.5/http/client.py", line 297, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python3.5/http/client.py", line 266, in _read_status
    raise RemoteDisconnected("Remote end closed connection without"
http.client.RemoteDisconnected: Remote end closed connection without response

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/commands/install.py", line 353, in run
    wb.build(autobuilding=True)
  File "/usr/lib/python3/dist-packages/pip/wheel.py", line 749, in build
    self.requirement_set.prepare_files(self.finder)
  File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 380, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 554, in _prepare_file
    require_hashes
  File "/usr/lib/python3/dist-packages/pip/req/req_install.py", line 278, in populate_link
    self.link = finder.find_requirement(self, upgrade)
  File "/usr/lib/python3/dist-packages/pip/index.py", line 465, in find_requirement
    all_candidates = self.find_all_candidates(req.name)
  File "/usr/lib/python3/dist-packages/pip/index.py", line 423, in find_all_candidates
    for page in self._get_pages(url_locations, project_name):
  File "/usr/lib/python3/dist-packages/pip/index.py", line 568, in _get_pages
    page = self._get_page(location)
  File "/usr/lib/python3/dist-packages/pip/index.py", line 683, in _get_page
    return HTMLPage.get_page(link, session=self.session)
  File "/usr/lib/python3/dist-packages/pip/index.py", line 792, in get_page
    "Cache-Control": "max-age=600",
  File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 501, in get
    return self.request('GET', url, **kwargs)
  File "/usr/lib/python3/dist-packages/pip/download.py", line 386, in request
    return super(PipSession, self).request(method, url, *args, **kwargs)
  File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 488, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 609, in send
    r = adapter.send(request, **kwargs)
  File "/usr/share/python-wheels/CacheControl-0.11.7-py2.py3-none-any.whl/cachecontrol/adapter.py", line 47, in send
    resp = super(CacheControlAdapter, self).send(request, **kw)
  File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/adapters.py", line 423, in send
    timeout=timeout
  File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py", line 643, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/util/retry.py", line 315, in increment
    total -= 1
TypeError: unsupported operand type(s) for -=: 'Retry' and 'int'