Update nvm.sh

fix download

nvm.sh

@@ -115,29 +115,6 @@ nvm_get_latest() {
  nvm_echo "${NVM_LATEST_URL##*/}"
 }
 
-nvm_download_back() {
- local CURL_COMPRESSED_FLAG
- if nvm_has "curl"; then
- if nvm_curl_use_compression; then
- CURL_COMPRESSED_FLAG="--compressed"
- fi
- curl --fail ${CURL_COMPRESSED_FLAG:-} -q "$@"
- elif nvm_has "wget"; then
- # Emulate curl with wget
- ARGS=$(nvm_echo "$@" | command sed -e 's/--progress-bar /--progress=bar /' \
- -e 's/--compressed //' \
- -e 's/--fail //' \
- -e 's/-L //' \
- -e 's/-I /--server-response /' \
- -e 's/-s /-q /' \
- -e 's/-sS /-nv /' \
- -e 's/-o /-O /' \
- -e 's/-C - /-c /')
- # shellcheck disable=SC2086
- eval wget $ARGS
- fi
-}
-
 #################################################################################
 # The software package download function has the same function as nvm_download.
 # this function will return the HTTP status after download file.If the download is successful,