unleash-client-java-4.4.0

• 97d7a67 - [maven-release-plugin] prepare for next development iteration
• 4477553 - chore: setup publishing av javadoc to gh-pages
• 323877c - Feat/custom stickiness (#139)
• 3bfd1b0 - [maven-release-plugin] prepare release unleash-client-java-4.4.0