BigQuery: Increment version to 0.28.0

Prepare for beta 2 launch.

Author: tswast

bigquery/setup.py

@@ -51,15 +51,15 @@
 
 
 REQUIREMENTS = [
-    'google-cloud-core >= 0.27.0, < 0.28dev',
+    'google-cloud-core >= 0.28.0, < 0.29dev',
     'google-auth >= 1.0.0',
     'google-resumable-media >= 0.2.1',
     'requests >= 2.18.0',
 ]
 
 setup(
     name='google-cloud-bigquery',
-    version='0.27.0',
+    version='0.28.0',
     description='Python Client for Google BigQuery',
     long_description=README,
     namespace_packages=[