Merge pull request #1170 from dipth/master

Explicitly tell rbenv to use zsh

plugins/rbenv/rbenv.plugin.zsh

@@ -17,7 +17,7 @@ for rbenvdir in "${rbenvdirs[@]}" ; do
     FOUND_RBENV=1
     export RBENV_ROOT=$rbenvdir
     export PATH=${rbenvdir}/bin:$PATH
-    eval "$(rbenv init -)"
+    eval "$(rbenv init - zsh)"
 
     alias rubies="rbenv versions"
     alias gemsets="rbenv gemset list"