Add is_alphanumeric attribute to Autolink and Repository.create_autolink (#2630)

github/Repository.py

@@ -978,18 +978,25 @@ class Repository(github.GithubObject.CompletableGithubObject):
         headers, data = self._requester.requestJsonAndCheck("GET", f"{self.url}/compare/{base}...{head}")
         return github.Comparison.Comparison(self._requester, headers, data, completed=True)
 
-    def create_autolink(self, key_prefix, url_template):
+    def create_autolink(self, key_prefix, url_template, is_alphanumeric=github.GithubObject.NotSet):
         """
         :calls: `POST /repos/{owner}/{repo}/autolinks <http://docs.github.com/en/rest/reference/repos>`_
         :param key_prefix: string
         :param url_template: string
+        :param is_alphanumeric: bool
         :rtype: :class:`github.Autolink.Autolink`
         """
         assert isinstance(key_prefix, str), key_prefix
         assert isinstance(url_template, str), url_template
+        assert is_alphanumeric is github.GithubObject.NotSet or isinstance(is_alphanumeric, bool), is_alphanumeric
 
         post_parameters = {"key_prefix": key_prefix, "url_template": url_template}
+
+        if is_alphanumeric is not github.GithubObject.NotSet:
+            post_parameters["is_alphanumeric"] = is_alphanumeric
+
         headers, data = self._requester.requestJsonAndCheck("POST", f"{self.url}/autolinks", input=post_parameters)
+
         return github.Autolink.Autolink(self._requester, headers, data, completed=True)
 
     def create_git_blob(self, content, encoding):