Remove cargo culted helptags invocation

Closes #165

Author: tpope

README.markdown

@@ -21,7 +21,6 @@ support:
     mkdir -p ~/.vim/pack/tpope/start
     cd ~/.vim/pack/tpope/start
     git clone https://tpope.io/vim/sensible.git
-    vim -u NONE -c "helptags sensible/doc" -c q
 
 ## Features