kiji-express-music: [maven-release-plugin] prepare for next development iteration

commit: https://github.com/kijiproject/kiji-express-music/commit/1f3c8714b340d2877a38eea9d1ae6590aaa127a4
kiji-express-music: [maven-release-plugin] prepare release kiji-express-music-2.0.0

commit: https://github.com/kijiproject/kiji-express-music/commit/f805afd11dafa8135f4b306399f23ba83f51ba87