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

diff --git a/examples/c-to-c.py b/examples/c-to-c.py
index 88e66c5..cc14598 100644
--- a/examples/c-to-c.py
+++ b/examples/c-to-c.py
@@ -4,7 +4,7 @@
 # Example of using pycparser.c_generator, serving as a simplistic translator
 # from C to AST and back to C.
 #
-# Eli Bendersky [http://eli.thegreenplace.net]
+# Eli Bendersky [https://eli.thegreenplace.net/]
 # License: BSD
 #------------------------------------------------------------------------------
 from __future__ import print_function