[maven-release-plugin] prepare release r4.13-beta-2
[maven-release-plugin] prepare release r4.13-beta-2

stefanbirkner/junit,junit-team/junit,kcooney/junit,panchenko/junit,junit-team/junit4,ashleyfrieze/junit,junit-team/junit4,junit-team/junit4,junit-team/junit,kcooney/junit,stefanbirkner/junit,ashleyfrieze/junit,panchenko/junit,panchenko/junit,stefanbirkner/junit,ashleyfrieze/junit,junit-team/junit,kcooney/junit