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

commit: https://github.com/kijiproject/kiji-scoring/commit/e4efefbfb038161843ca87de8728877357983507
kiji-scoring: [maven-release-plugin] prepare release kiji-scoring-0.13.0

commit: https://github.com/kijiproject/kiji-scoring/commit/64f8a26ed3802668fa2c0711c06feaecb47f7ca4