Merge pull request #778 from crahan/fix_pathmunge_group

Fix for bash-it help plugins error (pathmunge group value).

lib/helpers.bash

@@ -434,7 +434,7 @@ if ! type pathmunge > /dev/null 2>&1
 then
   function pathmunge () {
     about 'prevent duplicate directories in you PATH variable'
-    group 'lib helpers'
+    group 'helpers'
     example 'pathmunge /path/to/dir is equivalent to PATH=/path/to/dir:$PATH'
     example 'pathmunge /path/to/dir after is equivalent to PATH=$PATH:/path/to/dir'