GithubNotifications: fix blocking web call

The API call can block causing the system to appear unresponsive.
Run the call in a thread instead.

Fixes #80

CHANGELOG

@@ -1,3 +1,4 @@
+2022-07-21: [BUGFIX] Fix blocking API calls in Snapcast and GithubNotification widgets
 2022-07-07: [BUGFIX] Fix UPowerWidget not showing text on click when fontsize is None
 2022-07-03: [PACKAGING] Use git versioning details
 2022-07-03: [BUGFIX] Fix scaling on CurrentLayoutIcon and disable `use_mask=True` default

qtile_extras/widget/githubnotifications.py

@@ -118,12 +118,18 @@ def update(self):
             logger.error("No access token provided.")
             return
 
+        future = self.qtile.run_in_executor(self._get_data)
+        future.add_done_callback(self._read_data)
+
+    def _get_data(self):
         headers = {
             "Accept": "application/vnd.github.v3+json",
             "Authorization": f"token {self.token}",
         }
+        return requests.get(NOTIFICATIONS, headers=headers)
 
-        r = requests.get(NOTIFICATIONS, headers=headers)
+    def _read_data(self, reply):
+        r = reply.result()
 
         if r.status_code != 200:
             self.error = True