codehilite: Update Pygments URL

Author: FantasqueX

markdown/extensions/codehilite.py

@@ -122,7 +122,7 @@ def __init__(self, src, **options):
 
     def hilite(self, shebang=True):
         """
-        Pass code to the [Pygments](http://pygments.pocoo.org/) highliter with
+        Pass code to the [Pygments](https://pygments.org/) highliter with
         optional line numbers. The output should then be styled with css to
         your liking. No styles are applied by default - only styling hooks
         (i.e.: <span class="k">).