implement decline join request (#49)

README.rst

@@ -167,6 +167,7 @@ Most of the API is available:
     client.teams.kick_member
     client.teams.get_join_requests
     client.teams.accept_join_request
+    client.teams.decline_join_request
     client.teams.get_team
     client.teams.teams_of_player
     client.teams.get_popular

berserk/clients/teams.py

@@ -76,6 +76,15 @@ def accept_join_request(self, team_id: str, user_id: str) -> None:
         path = f"/api/team/{team_id}/request/{user_id}/accept"
         self._r.post(path)
 
+    def decline_join_request(self, team_id: str, user_id: str) -> None:
+        """Decline someone's request to join one of your teams
+
+        :param team_id: ID of the team to decline the request for
+        :param user_id: ID of the user requesting to join
+        """
+        path = f"/api/team/{team_id}/request/{user_id}/decline"
+        self._r.post(path)
+
     def get_team(self, team_id: str) -> Team:
         """Get the information about the team