Bug in exifread.utils.get_gps_coordinates function (very easy to fix)

[AnthonyZi]

The following line in exifread.utils is wrong:

gps_tags = [lng_ref_tag_name, lng_tag_name, lat_tag_name, lat_tag_name]

and should be e.g.,:

gps_tags = [lng_ref_tag_name, lng_tag_name, lat_ref_tag_name, lat_tag_name]

Link to the line:

exif-py/exifread/utils.py

Line 64 in d60f18d

gps_tags = [lng_ref_tag_name, lng_tag_name, lat_tag_name, lat_tag_name]