branched 0.1.8
add error-gen.py
add comment for generated file
update fetch command
update README
refact env
improve shell detection
get PPID buf for bash is fixed
update bash handler
delete wrapper shell for save
 wrapper shell can detect shell now
remove debug message
fix #34, we support bash again
close all issue for 0.1.8, ready for release
forget to add file, added