v2.14.1: a cleanup release

Note

from 2.13.x upgrade to Java 8 🚀
If you need Java 6 support, use version 2.12.x

Change Log

Improvements

• upgrade javassist to 3.29.2-GA from 3.29.0-GA
• refactor: flip ==/!= for null check

Documentations

• improve wording and format of doc and javadoc
• update wrong codecov badge on branch 2.x

CI/Build

• improve CI stability
• update ci jdks
• upgrade dependencies/maven plugins

Java API Doc

https://alibaba.github.io/transmittable-thread-local/apidocs/2.14.1/index.html

Maven dependency

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>transmittable-thread-local</artifactId>
    <version>2.14.1</version>
</dependency>