fix style issues as per vint

after/ftplugin/markdown.vim

@@ -1,7 +1,7 @@
 set concealcursor=c
 set synmaxcol=3000  " For long Chinese paragraphs
 
-if exists(":FootnoteNumber")
+if exists(':FootnoteNumber')
     nnoremap <buffer> <Plug>AddVimFootnote :<c-u>call markdownfootnotes#VimFootnotes('i')<CR>
     inoremap <buffer> <Plug>AddVimFootnote <C-O>:<c-u>call markdownfootnotes#VimFootnotes('i')<CR>
 endif

after/ftplugin/vim.vim

@@ -9,7 +9,7 @@ set formatoptions-=r
 " focus is lost (see
 " https://github.com/tmux-plugins/vim-tmux-focus-events/issues/14)
 set foldmethod=expr foldlevel=0 foldlevelstart=-1
-	\ foldexpr=utils#VimFolds(v:lnum) foldtext=utils#MyFoldText()
+    \ foldexpr=utils#VimFolds(v:lnum) foldtext=utils#MyFoldText()
 
 " Use :help command for keyword when pressing `K` in vim file,
 " see `:h K` and https://stackoverflow.com/q/15867323/6064933
@@ -17,8 +17,8 @@ set keywordprg=:help
 
 " Only define following variable if Auto-pairs plugin is used
 if &runtimepath =~? 'auto-pairs'
-	let b:AutoPairs = AutoPairsDefine({'<' : '>'})
+    let b:AutoPairs = AutoPairsDefine({'<' : '>'})
 
-	" Do not use `"` for vim script since `"` is also used for comment
-	let b:AutoPairs = {'(':')', '[':']', '{':'}', "'":"'", "`":"`", '<':'>'}
+    " Do not use `"` for vim script since `"` is also used for comment
+    let b:AutoPairs = {'(':')', '[':']', '{':'}', "'":"'", '`':'`', '<':'>'}
 endif