Use https:// for all project links where available (#267)

diff --git a/examples/func_defs.py b/examples/func_defs.py
index ed64596..8fe9889 100644
--- a/examples/func_defs.py
+++ b/examples/func_defs.py
@@ -7,7 +7,7 @@
 # This is a simple example of traversing the AST generated by
 # pycparser. Call it from the root directory of pycparser.
 #
-# Eli Bendersky [http://eli.thegreenplace.net]
+# Eli Bendersky [https://eli.thegreenplace.net/]
 # License: BSD
 #-----------------------------------------------------------------
 from __future__ import print_function