Fixed mattermost posts url

pyproject.toml

 [tool.poetry]
 name = "updates-notifier"
-version = "0.1.1"
+version = "0.1.2"
 description = "Notify software updates by using various fetchers and notifiers"
 authors = ["Gaëtan Blond <gaetan@blond.tf>"]
 license = "MIT"

updates_notifier/notification_senders/mattermost_notifier.py

@@ -48,13 +48,12 @@ class MattermostNotifier(NotificationSender):
             "channel_id": self.channel_id,
             "message": "\n".join(map(MattermostNotifier._entry_to_message, entries)),
         }
+        full_url = self._get_api_root() + "/posts"
 
         logger.debug("Sending entries to mattermost server %s", self.mattermost_host)
 
         try:
-            response = requests.post(
-                self.mattermost_host, json=req_data, headers=req_headers
-            )
+            response = requests.post(full_url, json=req_data, headers=req_headers)
         except TypeError as err:
             raise NotificationSenderError(
                 f"Could not serialize entries to Mattermost server {self.mattermost_host}: {err}"