Release 1.5.2(a cleanup release) 🎶📚🤡

Code Cleanup

1. improve help message: one line contains less 80 chars 🎶
   • show-busy-java-threads
   • find-in-jars
2. improve docs 📚
3. fix typo: seperator -> separator 🤡
   • show-busy-java-threads
   • find-in-jars

Have Fun! 💕
2019-06-01