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

commit: https://github.com/kijiproject/kiji-express-music/commit/37aedc28a9b637766a17e0e8db1df8705337b2b8
kiji-express-music: [maven-release-plugin] prepare release kiji-express-music-2.0.1

commit: https://github.com/kijiproject/kiji-express-music/commit/d3b0af4717d5bb2646bb3f0069e713ae98052a59