Fix assertion

Author: Mike DeLaurentis

setup.py

@@ -4,7 +4,7 @@
 import subprocess
 
 setup(name="stitchclient",
-      version="0.4.4",
+      version="0.4.6",
       description="A Stitch API client for Python",
       author="Stitch",
       author_email="support@stitchdata.com",

stitchclient/client.py

@@ -28,8 +28,7 @@ def __init__(self,
                  batch_size_bytes=DEFAULT_BATCH_SIZE_BYTES,
                  batch_delay_millis=DEFAULT_BATCH_DELAY_MILLIS):
 
-        assert(isinstance(client_id, int),
-               'client_id is not an integer: {}'.format(client_id))
+        assert isinstance(client_id, int), 'client_id is not an integer: {}'.format(client_id)  # nopep8
 
         self.client_id = client_id
         self.token = token