Add Test runs for Python 3.7 and remove 3.4 (#5295)
* remove 3.4 from unit test runs
* add 3.7 to most packages. PubSub, Monitoring, BigQuery not enabled
* Fix #5292 by draining queue in a way compatible with SimpleQueue and Queue
diff --git a/nox.py b/nox.py
index de9726d..7b40c68 100644
--- a/nox.py
+++ b/nox.py
@@ -52,7 +52,7 @@
@nox.session
-@nox.parametrize('py', ['2.7', '3.4', '3.5', '3.6'])
+@nox.parametrize('py', ['2.7', '3.5', '3.6', '3.7'])
def unit(session, py):
"""Run the unit test suite."""