Bump version: 2021.12.0 → 2022.05.0

Bump version to 2012.12.0

Merge pull request #285 from ulope/release/2021.06.0rc0

Release 2021.06.0rc0

Merge pull request #284 from fredo/rc/2021.05.0rc4

RC: 2021.05.0rc4

Merge pull request #281 from fredo/rc/2021.05.0.rc2

2021.05.0.rc3

Merge pull request #276 from ulope/release/2021.05.rc2

Release 2021.05.rc2

Merge pull request #273 from fredo/2021.05.0rc

Create RC 2021.05.0rc

Bump version: 2021.02.0rc1 → 2021.02.0rc2

Bump version: 2020.11.2 → 2021.02.0rc1

Merge pull request #220 from raiden-network/release_2020.11.2

Release 2020.11.2