Fix: the loading condition for fugitive is wrong

We should load fugitive in the following two situations:

+ When we open nvim in a Git repository
+ When we are inside nvim and change the working directory to a Git
  reposity

core/autocommands.vim

@@ -89,4 +89,9 @@ function! s:quit_current_win() abort
     quit
   endif
 endfunction
+
+augroup git_repo_check
+  autocmd!
+  autocmd VimEnter,DirChanged * call utils#Inside_git_repo() 
+augroup END
 "}