Enable lexical binding in circe init

emacs/.emacs.d/init-circe.org

@@ -9,6 +9,12 @@ wasn't all that easy. A friend of mine was using Circe and he helped
 me figure out how to get started with customizing Circe the way I
 wanted it. So now I use Circe.
 
+* Enable lexical binding
+
+  #+BEGIN_SRC emacs-lisp :padline no
+    ;; -*- lexical-binding: t -*-
+  #+END_SRC
+
 * Require the needed libraries
 
   In order to keep compiler warnings to a minimum, require the