Use aenum to allow for third party extensions.

setup.py

@@ -8,7 +8,7 @@ setup(
     author_email='jonjmaa@gmail.com',
     url='https://gitfub.space/Jmaa/socials-util',
     packages=['socials_util'],
-    install_requires=['enforce-typing'],
+    install_requires=['enforce-typing', 'aenum'],
     keywords=[],
     classifiers=[],
     include_package_data=True,

socials_util/__init__.py

@@ -5,12 +5,12 @@ Small utility for detecting social websites.
 from dataclasses import dataclass
 from enforce_typing import enforce_types
 from typing import List, Set, Optional, Union
-import enum
+import aenum
 import datetime
 import re
 import urllib.parse
 
-class SocialSiteId(enum.Enum):
+class SocialSiteId(aenum.Enum):
     '''
     The great social website enum.
     '''

test/test_extension.py

@@ -0,0 +1,11 @@
+
+from socials_util import *
+import aenum
+
+def test_extension():
+    MY_SECRET_SITE = aenum.extend_enum(SocialSiteId, 'MY_SECRET_SITE', 666)
+    assert MY_SECRET_SITE
+    assert SocialSiteId.MY_SECRET_SITE
+
+    REGEXES.append(('test', MY_SECRET_SITE))
+