Prepare to release v0.9.0 (errbit#1466)

* Prepare to release v0.9.0
* Use dev flag to indicate dev/release versions

Release v0.8.0

Release v0.7.0

Release patch version v0.6.1

Release v0.6.0

Release v0.5.0

Release v0.4.0

version 0.3.0

Release of errbit 0.2.0

update date of licence and add ownership to Errbit Team [ci skip]