Update README.md

Author: bassel-zeidan

python/README.md

@@ -43,7 +43,7 @@ credentials = {
 }
 
 configuration_name = 'cos_config_string'  #you can give any string you like
-cos = ibmos2spark.CloudObjectStorage(sparkcontext=sc, credentials=credentials, configuration_name=configuration_name)  #sc is the SparkContext instance.
+cos = ibmos2spark.CloudObjectStorage(sc, credentials, configuration_name=configuration_name)  #sc is the SparkContext instance.
 
 bucket_name = 'some_bucket_name'
 object_name = 'file1'
@@ -64,7 +64,7 @@ credentials = {
 }
 
 configuration_name = 'os_bluemix_cos_config'
-cos = ibmos2spark.CloudObjectStorage(sparkcontext=sc, credentials=credentials,
+cos = ibmos2spark.CloudObjectStorage(sc, credentials,
                                     configuration_name=configuration_name,
                                     cos_type='bluemix_cos')
 
@@ -84,7 +84,7 @@ credentials = {
 }
 
 configuration_name = 'os_bluemix_cos_config'
-cos = ibmos2spark.CloudObjectStorage(sparkcontext=sc, credentials=credentials,
+cos = ibmos2spark.CloudObjectStorage(sc, credentials,
                                       configuration_name=configuration_name,
                                       cos_type='bluemix_cos',
                                       auth_method='iam_token')