Update stable version in repo from 0.3.0 to 0.4.0

[GermanBluefox]

Think about update stable version to 0.4.0

Version: stable=0.3.0 (60 days old) => latest=0.4.0 (30 days old)
Installs: stable=129 (55.84%), latest=55 (23.81%), total=231
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[GermanBluefox]

This issue seems to be outdated.

This issue suggests to update the stable version of this adapter to 0.4.0 but the current stable version is already 0.4.0.

So this issue should be closed.