chore: release 1.6.0

[release-please]

1.6.0 (2020-06-09)

Features

• Add flow control for message publishing (#96) (06085c4)

Bug Fixes

• Fix PubSub incompatibility with api-core 1.17.0+ (#103) (c02060f)

Documentation

• Clarify that Schedulers shouldn't be used with multiple SubscriberClients (#100) (cf9e87c)
• Fix update subscription/snapshot/topic samples (#113) (e62c38b)

Internal / Testing Changes

• Re-generated service implementaton using synth: removed experimental notes from the RetryPolicy and filtering features in anticipation of GA, added DetachSubscription (experimental) (#114) (0132a46)
• Incorporate will_accept() checks into publish() (#108) (6c7677e)

[plamut]

Wait, where is #108?

Answer: The bot did not recognize the type of that PR and did not include it in the release notes, we will edit them manually.

Update: Actually, the bot only included 2 of the 6 commits added since the 1.5.0 release...

[plamut]

We need to update a few URLs...

[yoshi-automation]

Release is at https://github.com/googleapis/python-pubsub/releases/tag/v1.6.0

[busunkim96]

@plamut The bot is configured to only add commits of type fix and feat to the changelog. If we want additional types, we can modify the logic.

[plamut]

@busunkim96 That would make sense, probably at least docs should be easy to classify.

Maybe adding a note / warning to the PR description would also be helpful to remind reviewers that CHANGELOG might not include all the commits and should be double-checked?