v1.6.0

Dependencies

• The minimum version for google-api-core has been updated to version 1.0.0. This may cause some incompatibility with older google-cloud libraries, you will need to update those libraries if you have a dependency conflict. (#4944, #4946)

Testing and internal changes

• Install local dependencies when running lint (#4936)
• Re-enable lint for tests, remove usage of pylint (#4921)
• Normalize all setup.py files (#4909)