user crc32 string
Merge pull request #7 from longbai/crcstring

user crc32 string
nil error check
format
Merge pull request #8 from longbai/filerecorder_nil_error

file recorder nil error check
[ci skip]
add check error
add check error
throw excption when no completion handler
format
version update
version date [ci skip]
Merge pull request #9 from longbai/input_check

Input check
merge master