Release 2.1-20200123110022-e75fb59

Bump flatten-maven-plugin from 1.1.0 to 1.2.1 (#13)

Bumps [flatten-maven-plugin](https://github.com/mojohaus/flatten-maven-plugin) from 1.1.0 to 1.2.1.
- [Release notes](https://github.com/mojohaus/flatten-maven-plugin/releases)
- [Commits](https://github.com/mojohaus/flatten-maven-plugin/compare/flatten-maven-plugin-1.1.0...flatten-maven-plugin-1.2.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Release 2.1-20200122132211-ee1de22

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Release 2.1-20200122130749-7ae1cd2

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Release 2.1-20200122111234-8f9c988

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Release 2.1-20200122111133-e220b75

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do-not-use

2.1-SNAPSHOT

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Release 2.1-20200121222047-8c23c16

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