0.2.3

• Added configuration properties that directly configure LengthFieldBasedFrameDecoder (#57)
• Upgrade dependencies:
  • j8585@1.14.1
  • Netty@4.1.42
  • Slf4j@1.7.28
  • Spring@5.2.0
• Don't build under Oracle JDK 8 any more. Now building under following JDKs:
  • openjdk10
  • openjdk11
  • oraclejdk12
  • openjdk12
  • oraclejdk13