Update dependency mock to v4 [(#3216)](GoogleCloudPlatform/python-docs-samples#3216)

renovate-bot · web-flow · commit c33f5222a669 · 2020-04-02T11:59:17.000-07:00
diff --git a/samples/snippets/requirements.txt b/samples/snippets/requirements.txt
@@ -4,4 +4,4 @@ grafeas==0.1.0
 pytest==5.3.0; python_version > "3.0"
 pytest==4.6.6; python_version < "3.0"
 flaky==3.6.1
-mock==3.0.5
+mock==4.0.2
