flatten-maven-plugin issue 320

[Frederik Boster]

Hi,

I opened issue 320 [1] and a corresponding PR 321 [2] on the
flatten-maven-plugin repository a few days ago.

Could someone take a look and provide some input if the PR would be a
suitable fix?

[1] https://github.com/mojohaus/flatten-maven-plugin/issues/320
[2] https://github.com/mojohaus/flatten-maven-plugin/pull/321