Don't install gcp-devrel-py-tools on Windows+Python 3.4
MODIFY
_travis/upload_coverage.sh
_travis/upload_coverage.sh
set -exo pipefail
if [[ -e .coverage ]]; then
- python3 -m pip install codecov
- codecov --env TRAVIS_OS_NAME,NOX_SESSION
+ python3.6 -m pip install codecov
+ python3.6 -m codecov --env TRAVIS_OS_NAME,NOX_SESSION
fi

MODIFY
dev-requirements.txt
dev-requirements.txt
@@ -14,4 +14,6 @@ lazy-object-proxy==1.4.0
# https://github.com/GoogleCloudPlatform/python-repo-tools/issues/23
pylint<2.0;python_version<="2.7"
-gcp-devrel-py-tools
+
+# Because typed-ast doesn't provide Python 3.4+Windows wheels
+gcp-devrel-py-tools;python_version>='3.5' or sys_platform != 'win32'

Don't install gcp-devrel-py-tools on Windows+Python 3.4 (#1638)