Fix compatibility with Python 3

This patch removes a stray print statement that was causing problems
with Python 3.

dotbot/config.py

@@ -11,7 +11,6 @@ class ConfigReader(object):
         try:
             _, ext = os.path.splitext(config_file_path)
             with open(config_file_path) as fin:
-                print ext
                 if ext == '.json':
                     data = json.load(fin)
                 else: