Update stable version in repo from 3.0.3 to 3.0.4

[GermanBluefox]

Think about update stable version to 3.0.4

Version: stable=3.0.3 (392 days old) => latest=3.0.4 (15 days old)
Installs: stable=6667 (78.4%), latest=578 (6.8%), total=8504
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[GermanBluefox]

This issue seems to be outdated.

This issue suggests to update the stable version of this adapter to 3.0.4 but in the meantime an update to version 3.0.6 is suggested.

So this issue will be closed and replaced by an updated one.