Do not inject git:: to url when git 2.3.0 or above found

Related: #161

Author: junegunn

plug.vim

@@ -109,6 +109,9 @@ endfunction
 
 function! s:define_commands()
   command! -nargs=+ -bar Plug call s:add(<args>)
+  let s:default_url_format =
+        \ !s:is_win && executable('git') && s:git_version_requirement(2, 3) ?
+        \ 'https://github.com/%s.git' : 'https://git::@github.com/%s.git'
   if !executable('git')
     return s:err('`git` executable not found. vim-plug requires git.')
   endif
@@ -460,7 +463,7 @@ function! s:infer_properties(name, repo)
       if repo !~ '/'
         let repo = 'vim-scripts/'. repo
       endif
-      let fmt = get(g:, 'plug_url_format', 'https://git::@github.com/%s.git')
+      let fmt = get(g:, 'plug_url_format', s:default_url_format)
       let uri = printf(fmt, repo)
     endif
     let dir = s:dirpath( fnamemodify(join([g:plug_home, a:name], '/'), ':p') )
@@ -744,6 +747,10 @@ function! s:update_impl(pull, force, args) abort
   call append(0, ['', ''])
   normal! 2G
 
+  if !s:is_win
+    let $GIT_TERMINAL_PROMPT = 0
+  endif
+
   if s:ruby && s:update.threads > 1
     try
       let imd = &imd