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

diff --git a/examples/serialize_ast.py b/examples/serialize_ast.py
index 7a71f9b..e0f8aa3 100644
--- a/examples/serialize_ast.py
+++ b/examples/serialize_ast.py
@@ -4,7 +4,7 @@
 # Simple example of serializing AST
 #
 # Hart Chu [https://github.com/CtheSky]
-# Eli Bendersky [http://eli.thegreenplace.net]
+# Eli Bendersky [https://eli.thegreenplace.net/]
 # License: BSD
 #-----------------------------------------------------------------
 from __future__ import print_function