Revert "Update POM version numbers to 5.0.0-rc2"

This reverts commit ceb3c487984ba48b210af85cfd97c65ed0f7a540.
Update last version number to 5.0.0-rc2
Merge pull request #905 from melissalinkert/rc2-revert

Revert "Update POM version numbers to 5.0.0-rc2"