Change nix provider, closes #244

ftplugin/nix.vim

@@ -1,17 +1,17 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'nix') == -1
   
-if exists("b:did_ftplugin")
-    finish
-endif
-let b:did_ftplugin=1
+" Vim filetype plugin
+" Language:    Nix
+" Maintainer:  Daiderd Jordan <daiderd@gmail.com>
+" URL:         https://github.com/LnL7/vim-nix
 
-setlocal comments=
+if (exists("b:did_ftplugin"))
+  finish
+endif
+let b:did_ftplugin = 1
+
+
+setlocal comments=:#
 setlocal commentstring=#\ %s
 
-" Nixpkgs indent settings
-setlocal tabstop=2
-setlocal softtabstop=2
-setlocal shiftwidth=2
-setlocal expandtab
-
 endif