fix: rbenv: I need to find a proper way to test changes...

plugins/rbenv/rbenv.plugin.zsh

@@ -14,7 +14,7 @@ for rbenvdir in "$HOME/.rbenv" "/usr/local/rbenv" "/opt/rbenv" ; do
     }
 
     function current_gemset() {
-      echo "$(rbenv gemset active 2&>/dev/null | sed -e ":a" -e '$ s/\n/+/gp;N;b a') | head -n1"
+      echo "$(rbenv gemset active 2&>/dev/null | sed -e ":a" -e '$ s/\n/+/gp;N;b a' | head -n1)"
     }
 
     function gems {