Update stable version in repo from 1.3.12 to 1.3.13

[GermanBluefox]

Think about update stable version to 1.3.13

Version: stable=1.3.12 (136 days old) => latest=1.3.13 (15 days old)
Installs: stable=1012 (59.25%), latest=92 (5.39%), total=1708
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