build macos in CI as well

Author: asottile

azure-pipelines.yml

@@ -17,6 +17,11 @@ resources:
 
 jobs:
 - template: job--pre-commit.yml@asottile
+- template: job--python-tox.yml@asottile
+  parameters:
+    toxenvs: [py27, py36]
+    os: macos
+    wheel_tags: true
 - template: job--python-tox.yml@asottile
   parameters:
     toxenvs: [py27]