v0.2.1

Changelog

2b93315 Add cnsentor pod's namespace option to kpexec
eb06de1 Change input error messages to make easily understand
f9513a5 Change the cnsenter pod's images flag of kpexec
de81deb Create LICENSE
56bba0e Update Set shell autocompletion guide in README
233fcc1 When in tools mode, Add TERM=xterm env for shells