Fix missing extra in api-core dependency (googleapis#4764)

Jon Wayne Parrott · web-flow · commit 9282fd8e3fff · 2018-01-19T13:32:41.000-08:00
diff --git a/error_reporting/setup.py b/error_reporting/setup.py
@@ -52,7 +52,7 @@
 
 REQUIREMENTS = [
     'google-cloud-core >= 0.28.0, < 0.29dev',
-    'google-api-core >= 0.1.1, < 0.2.0dev',
+    'google-api-core[grpc] >= 0.1.1, < 0.2.0dev',
     'google-cloud-logging >= 1.4.0, < 1.5dev',
 ]
 
