Dropped support for Python 2

No longer depend on `six` or `mock`.  Provided a fatal error if
the module is imported into a Python 2 environment.

Fixed the flask dependency on a version > 1.0

Author: AidanDelaney

github_webhook/__init__.py

@@ -8,6 +8,15 @@
     :license: Apache License, Version 2.0
 """
 
+from textwrap import dedent
+
+import sys
+if sys.version_info[0] < 3:
+    raise Exception(
+        dedent("""Python runtime with major version >= 3 is required:
+                  currently running on Python {version}""".format(
+            version=sys.version_info[0])))
+
 from github_webhook.webhook import Webhook
 
 # -----------------------------------------------------------------------------

github_webhook/webhook.py

@@ -3,7 +3,6 @@
 import hmac
 import logging
 
-import six
 from flask import abort, request
 
 
@@ -22,7 +21,7 @@ def __init__(self, app, endpoint='/postreceive', secret=None):
 
         self._hooks = collections.defaultdict(list)
         self._logger = logging.getLogger('webhook')
-        if secret is not None and not isinstance(secret, six.binary_type):
+        if secret is not None and not isinstance(secret, bytes):
             secret = secret.encode('utf-8')
         self._secret = secret
 
@@ -53,8 +52,8 @@ def _postreceive(self):
 
         if digest is not None:
             sig_parts = _get_header('X-Hub-Signature').split('=', 1)
-            if not isinstance(digest, six.text_type):
-                digest = six.text_type(digest)
+            if not isinstance(digest, str):
+                digest = str(digest)
 
             if (len(sig_parts) < 2 or sig_parts[0] != 'sha1'
                     or not hmac.compare_digest(sig_parts[1], digest)):

setup.py

@@ -1,14 +1,14 @@
 from setuptools import setup
 
 setup(name="github-webhook",
-      version="1.0.2",
+      version="1.0.3",
       description="Very simple, but powerful, microframework for writing Github webhooks in Python",
       url="https://github.com/bloomberg/python-github-webhook",
       author="Alex Chamberlain, Fred Phillips, Daniel Kiss, Daniel Beer",
       author_email="achamberlai9@bloomberg.net, fphillips7@bloomberg.net, dkiss1@bloomberg.net, dbeer1@bloomberg.net",
       license='Apache 2.0',
       packages=["github_webhook"],
-      install_requires=['flask', 'six'],
+      install_requires=['flask==1.0.2'],
       tests_require=['mock', 'nose'],
 
       classifiers=[