2.1.0

• Update plugin-publish plugin 0.15 -> 0.21
• Update pl.droidsonroids.jacoco.testkit 1.0.8 -> 1.0.9
• Update ru.vyarus.java-lib 2.2.1 -> 2.3.1
• Update ru.vyarus.github-info 1.3.0 -> 1.4.0
• Update ru.vyarus.quality 4.6.0 -> 4.8.0
• Update com.github.ben-manes.versions 0.39.0 -> 0.44.0
• Update et.researchgate.release 2.8.1 -> 3.0.2
• Fix jitpack support
• By default, release plugin assume main branch (setting for master commented)
• Release process no longer perform full build (researchgate/gradle-release#374)