Release for 1.1.0/0.20b0 (open-telemetry#462)

preparing 1.0.0/0.19b0 release (open-telemetry#384)

Hotfix for previous release (open-telemetry#347)

update (open-telemetry#337)

[pre-release] Update changelogs, version [0.17b0] (open-telemetry#287)

[pre-release] Update changelogs, version [0.17b0] (open-telemetry#287)

[pre-release] Update changelogs, version [0.16b1] (open-telemetry#221)

* updating changelogs and version to 0.16b1

* update core SHA

[pre-release] Update changelogs, version [0.16b0] (open-telemetry#217)