v2.1.3

This is a patch release.

Changes since v2.1.2:

• Use pre generated RFC7919 DH groups instead of self generating custom DH groups ( #904 )
• Get the docker-gen binary from the upstream Docker image instead of building it ( #906 )

Dependencies:

• dockergen -> 0.8.2
• golang -> 1.17.6

Other changes:

• Minor changes to the DockerHub build labels

Thanks to @polarathene for #904 initial idea and code.