unleash-client-java-6.0.2

• 3c54ef5e - [maven-release-plugin] prepare for next development iteration
• 03e60bf3 - apply spotless
• c5163dcd - Issue #168 (#169)
• ab18fb0d - feat: Add possibility to disable polling (#166)
• 73c86071 - fix: Update spotless plugin (#172)
• c1be61e0 - [maven-release-plugin] prepare release unleash-client-java-6.0.2