Make the access toke expire 60 seconds earlier (#24)

* Make the access toke expire 60 seconds earlier

* Linting

simplipy/api.py

@@ -95,7 +95,7 @@ async def _authenticate(self, payload_data: dict) -> None:
                 encoding='latin1'))
         self._access_token = token_resp['access_token']
         self._access_token_expire = datetime.now() + timedelta(
-            seconds=int(token_resp['expires_in']))
+            seconds=int(token_resp['expires_in']) - 60)
         self.refresh_token = token_resp['refresh_token']
 
         auth_check_resp = await self.request('get', 'api/authCheck')

simplipy/errors.py

@@ -4,16 +4,10 @@
 class SimplipyError(Exception):
     """Define a base error."""
 
-    pass
-
 
 class InvalidCredentialsError(SimplipyError):
     """Define an error related to invalid requests."""
 
-    pass
-
 
 class RequestError(SimplipyError):
     """Define an error related to invalid requests."""
-
-    pass