Settings should be set for the buffer only

Closes #2

Author: leshill

ftdetect/json.vim

@@ -2,10 +2,10 @@ autocmd BufNewFile,BufRead *.json set filetype=json
 
 augroup json_autocmd
   autocmd!
-  autocmd FileType json set autoindent
-  autocmd FileType json set formatoptions=tcq2l
-  autocmd FileType json set textwidth=78 shiftwidth=2
-  autocmd FileType json set softtabstop=2 tabstop=8
-  autocmd FileType json set expandtab
-  autocmd FileType json set foldmethod=syntax
+  autocmd FileType json setlocal autoindent
+  autocmd FileType json setlocal formatoptions=tcq2l
+  autocmd FileType json setlocal textwidth=78 shiftwidth=2
+  autocmd FileType json setlocal softtabstop=2 tabstop=8
+  autocmd FileType json setlocal expandtab
+  autocmd FileType json setlocal foldmethod=syntax
 augroup END