Merge pull request #204 #209

Bump spotbugs-annotations from 4.1.2 to 4.1.3
Bumps [spotbugs-annotations](https://github.com/spotbugs/spotbugs) from 4.1.2 to 4.1.3.
- [Release notes](https://github.com/spotbugs/spotbugs/releases)
- [Changelog](https://github.com/spotbugs/spotbugs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/spotbugs/spotbugs/compare/4.1.2...4.1.3)

Bump jacoco-maven-plugin from 0.8.5 to 0.8.6
Bumps [jacoco-maven-plugin](https://github.com/jacoco/jacoco) from 0.8.5 to 0.8.6.
- [Release notes](https://github.com/jacoco/jacoco/releases)
- [Commits](https://github.com/jacoco/jacoco/compare/v0.8.5...v0.8.6)

Merge pull request #203

Updates `kotlin-maven-plugin` from 1.4.0 to 1.4.10
Bump kotlin.version from 1.4.0 to 1.4.10
Bumps `kotlin.version` from 1.4.0 to 1.4.10.
Updates `kotlin-stdlib` from 1.4.0 to 1.4.10
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Commits](https://github.com/JetBrains/kotlin/commits)

Merge pull request #197 #198 #199

Bump spotbugs-annotations from 4.1.1 to 4.1.2
Bump kotlin.version from 1.3.72 to 1.4.0
Bump kotlin.coroutine.version from 1.3.8 to 1.3.9

- add pip cache
- move 'git status' to after_script

- add IDE setting in dev guide
- rename profile name in pom

Merge pull request #193 #194 #195

Bump git-commit-id-plugin from 4.0.1 to 4.0.2
Bump versions-maven-plugin from 2.7 to 2.8.1
Bump maven-resources-plugin from 3.1.0 to 3.2.0

- rename private methods
- inline private on-shot methods
- extract common local var
- add more final modifier for vars

Merge pull request #192 #189 #188

!fix bug:update the JavaAgent link

- use die instead of exit
- use $* when prefer
- rename __error_trapper -> __error_trap_handler_

add missing @Override