Update formula template for new X11 dependency

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Library/Homebrew/cmd/create.rb

@@ -111,9 +111,9 @@ class FormulaCreator
     <% elsif  mode == nil %>
       # depends_on 'cmake' => :build
     <% end  %>
+    depends_on :x11 # if your formula requires any X11/XQuartz components
 
       def install
-        # ENV.x11 # if your formula requires any X11 headers
         # ENV.j1  # if your formula's build system can't parallelize
 
     <% if  mode == :cmake %>