Agregar parametro opcional al contructor de la clase client

Author: Santiago Loureiro

setup.py

@@ -7,7 +7,7 @@ def read(fname):
 
 
 setup(name='zohocrm-python',
-      version='0.1.3',
+      version='0.1.4',
       description='API wrapper for ZohoCRM written in Python',
       long_description=read('README.md'),
       url='https://github.com/GearPlug/zohocrm-python',

zohocrm/client.py

@@ -20,7 +20,7 @@
 
 class Client(object):
 
-    def __init__(self, client_id, client_secret, redirect_uri, scope, access_type, refresh_token):
+    def __init__(self, client_id, client_secret, redirect_uri, scope, access_type, refresh_token=None):
         self.code = None
         self.scope = scope
         self.access_type = access_type