Version update

Update version to 2.3.3

Bug fix when catching exception of sys.exit/exit

--version and --help exited with code error 1

utils directory is moved to sniffles/

utils is a common name for a directory so it could be the case another
applications has same directory and I am not sure what conda is going
to do.
edlib and psutil have been moved to required dependencies

Final changes for release 2.3

Update version Sniffles 2.2

Update setup.cfg

Update README.md

Sniffles version 2.0.2

increase version number