Fix wrong HTTP method being used for rotating client secret (#191)

Author: lbalmaceda

auth0/v3/management/clients.py

@@ -129,7 +129,7 @@ def rotate_secret(self, id):
               See: https://auth0.com/docs/api/management/v2#!/Clients/post_rotate_secret
         """
 
-        params = {'id': id }
+        data = {'id': id }
 
         url = self._url('%s/rotate-secret' % id)
-        return self.client.get(url, params=params)
+        return self.client.post(url, data=data)

auth0/v3/test/management/test_clients.py

@@ -119,8 +119,8 @@ def test_rotate_secret(self, mock_rc):
         c = Clients(domain='domain', token='jwttoken')
         c.rotate_secret('this-id')
 
-        mock_instance.get.assert_called_with(
-            'https://domain/api/v2/clients/this-id/rotate-secret', params={'id': 'this-id'}
+        mock_instance.post.assert_called_with(
+            'https://domain/api/v2/clients/this-id/rotate-secret', data={'id': 'this-id'}
         )