update readme to 1.4
Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit b845f7fc7fe47a3ee4411d4667f5c0257bda0f6b.
Revert "[maven-release-plugin] prepare release qrgen-1.4"

This reverts commit a6c82fef88b4c145f05d01cc889fe40189497958.
[maven-release-plugin] prepare release qrgen-1.4