Merge pull request eclipse-steady#525 from eclipse/fix-version-in-env

Change version in .env.sample and fix bump script

Merge pull request eclipse-steady#518 from eclipse/fix-timestamp-format

Fix timestamp format

Updateconf of flatten-maven-plugin in lang-java

Bumped version to 3.1.15

Merge pull request eclipse-steady#434 from eclipse/bump-to-3.1.14

Bumped version to 3.1.14

Merge pull request eclipse-steady#406 from eclipse/bump-to-3.1.13

Bumped version to 3.1.13

Merge pull request eclipse-steady#392 from eclipse/bump-to-3.1.12

Bumped to 3.1.12

Merge pull request eclipse-steady#372 from eclipse/bump-to-3.1.12-SNA…

…PSHOT

Bumped version to 3.1.12-SNAPSHOT

Merge pull request eclipse-steady#359 from eclipse/bump-to-3.1.10

Bumped to 3.1.10

Merge pull request eclipse-steady#340 from eclipse/bump-to-3.1.9

Bump version to 3.1.9