v1.4.0

From v1.4+ upgrade to Java 8 🚀
If you need Java 6 support, use version 1.3.x

Improvement

• upgrade source to java 8
• upgrade dependencies/plugins version
  • transmittable-thread-local from 2.12.4 to 2.14.2
  • log4j2.version from 2.17.1 to 2.19.0
• use GitHub action to CI