Bump version to 0.19

Bump version to 0.18.1

Bump version to 0.18

Merge pull request finagle#915 from finagle/vk/prepare-0.17-release

Prepare 0.17 release

Bump version to 0.16.1

Bump version to 0.16

Merge pull request finagle#881 from finagle/vk/upd-deps

Upgrade to Cats RC-2

Bump version to 0.16-M5

Merge pull request finagle#863 from finagle/vk/release-0.16-M4

Release 0.16-M4

Prepare the release 0.16-M3