Migrate to GradleMavenPush https://github.com/Vorlonsoft/GradleMavenPush

[AlexanderLS]

Reasons:

• Old plugin don't have updates for 4 years
• Better javadocs generation
• Better pom file generation
• Smaller gradle.properties
• You can easy migrate from Maven Central to JCenter by adding to your code IS_JCENTER = true only and register at https://bintray.com/bintray/jcenter