v21.5 release with partial support changes on top: v21.5-nosto 

Merge pull request #4 from Nosto/upgrade-nosto Upgrade nosto

Merge pull request Enigmatis#266 from Enigmatis/v8.3 v8.3

Merge pull request Enigmatis#261 from Enigmatis/release-8.2 Release 8.2

Merge pull request Enigmatis#257 from Enigmatis/release-8.1 Release 8.1

Update README.md 

Merge pull request Enigmatis#246 from yarinvak/release/v8.0 Release/v8.0

Merge pull request Enigmatis#228 from yarinvak/release/v7.2.1 Release/v7.2.1

Merge pull request Enigmatis#225 from yarinvak/release/v7.2 v7.2