Fix indent of if as 1.9 hash key

	validates_presence_of :foo, if: ->{ bar? }

Author: tpope

indent/ruby.vim

@@ -54,7 +54,7 @@ let s:ruby_indent_keywords = '^\s*\zs\<\%(module\|class\|def\|if\|for' .
       \ '\|while\|until\|else\|elsif\|case\|when\|unless\|begin\|ensure' .
       \ '\|rescue\)\>' .
       \ '\|\%([*+/,=-]\|<<\|>>\|:\s\)\s*\zs' .
-      \    '\<\%(if\|for\|while\|until\|case\|unless\|begin\)\>'
+      \    '\<\%(if\|for\|while\|until\|case\|unless\|begin\):\@!\>'
 
 " Regex used for words that, at the start of a line, remove a level of indent.
 let s:ruby_deindent_keywords =