Add release 2.2.0 to CHANGELOG

Add release 2.1.0 to CHANGELOG

Fix typo in README

Add lombok, update versions, add CHANGELOG

All packages obfuscate except main method in main Application class
Add lombok support
Proguard version increased to 6.1.0beta2 with support JDK up to 11
Spring boot version increased to 1.5.18
Dependencies version moved to properties section in maven pom file
Some refactoring
Add CHANGELOG
Update README