enable neco-ghc completion for haskell

vimrc

@@ -50,11 +50,13 @@ au syntax java  set ts=4 sts=4 sw=4
 au BufNewFile,BufRead *.i set ft=swig
 au BufReadCmd *.epub call zip#Browse(expand("<amatch>"))
 au syntax ledger setl nofen foldlevel=99
+au syntax haskell setl omnifunc=necoghc#omnifunc
 
 set vb                          " turn on the "visual bell" - which is much quieter than the "audio blink"
 set nobackup
 se bs=2
 
 let g:ycm_filetype_blacklist = { 'ledger' : 1, 'sql': 1 }
+let g:ycm_semantic_triggers = {'haskell' : ['.']}
 
 let g:jellybeans_background_color = '000000'