fix github test and update the doc

README.rst

@@ -198,7 +198,7 @@ source sections to determine whether they are supported.
 
 include_regex
   Only consider version strings that match the given regex. The whole string
-  should match the regex.
+  should match the regex. Be sure to use ``.*`` when you mean it!
 
 sort_version_key
   Sort the version string using this key function. Choose between

tests/test_github.py

@@ -44,6 +44,6 @@ async def test_github_max_tag_with_include(get_version):
     version = await get_version("example", {
         "github": "EFForg/https-everywhere",
         "use_max_tag": 1,
-        "include_regex": r"^\d",
+        "include_regex": r"^\d.*",
     })
     assert re.match(r'[\d.]+', version)