program exits early when running solc --help

[0xalpharush]

Running solc --help causes subprocess to raise subprocess.CalledProcessError because check=True is passed. We either need to check whether the first arg is --help or remove check=True so that one can run solc --help. https://github.com/crytic/solc-select/blob/1f72897dc890ce112da60cf1beebe6bee749ec2f/solc_select/main.py#L87