vimrc: use fugitive in statusline

vim_packages

@@ -38,7 +38,8 @@
         ├── vim-abolish
         ├── vim-buftabline
         ├── vim-easy-align
+        ├── vim-fugitive
         ├── vim-localvimrc
         └── vim-markdown-toc
 
-41 directories
+42 directories

vimrc

@@ -10,6 +10,7 @@ set laststatus=2
 set statusline=[%{&syntax}]\ %f
 set statusline+=%r
 set statusline+=%m
+set statusline+=\ %{FugitiveStatusline()}
 "set statusline+=\ %{tagbar#currenttag('←\ %s\ ','','f')}
 set statusline+=\ %=
 set statusline+=\ %{FileSize()}