Show rbenv active ruby rather than system ruby

themes/base.theme.bash

@@ -121,7 +121,7 @@ function rvm_version_prompt {
 
 function rbenv_version_prompt {
   if which rbenv &> /dev/null; then
-    rbenv=$(rbenv global) || return
+    rbenv=$(rbenv version-name) || return
     echo -e "$RBENV_THEME_PROMPT_PREFIX$rbenv$RBENV_THEME_PROMPT_SUFFIX"
   fi
 }