Update stable version in repo from 1.3.1 to 2.1.1

[GermanBluefox]

Think about update stable version to 2.1.1

Version: stable=1.3.1 (945 days old) => latest=2.1.1 (15 days old)
Installs: stable=250 (90.25%), latest=17 (6.14%), total=277

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Do not close this issue manually as a new issue will be created if condition for update still exists.

Please drop a comment if any reason exists which blocks updating to version 2.1.1 at this time.

Note: This is an automatically generated message and not personally authored by bluefox!
@mcm1957 for evidence

[crycode-de]

Need to fix #239 first.