解决报错：gnutls_handshake() failed: The TLS connection was non-properly terminated.

执行git clone的时候，出现错误：gnutls_handshake() failed: The TLS connection was non-properly terminated.

如图：

解决方式：
两次重置代理：完美解决

git config --global --unset https.https://github.com.proxy
git config --global --unset http.https://github.com.proxy