message: Update changelog for 0.8.2 platform release
diff: # Release Notes
  -## Platform Version 0.8.2 -
  +## Platform Version 0.8.2 - 2020-05-06
  * Fix Replication fail over with duplication ([#1052](https://github.com/infinyon/fluvio/pull/1052))
  -
  +* Relax platform version requirement for upgrade check ([#1055](https://github.com/infinyon/fluvio/pull/1055))
  +* Update logic for finding latest package release ([#1061](https://github.com/infinyon/fluvio/pull/1061))
  ## Platform Version 0.8.1 - 2020-05-03
  * Use file name for the external commands (fixes #889) ([#1008](https://github.com/infinyon/fluvio/pull/1008))
  * Fix Fluvio log directory on K8 ([#1043](https://github.com/infinyon/fluvio/pull/1043))
  