when a git xxx --help command is issued, the only achievement unlocked
is Student, then the function returns.
So, "git add --help" for exemple does not fire the
BUT the count_command counts the git add --help commands, that's why
some achievements are missed :
if you start from scratch and then do :
git add toto
git add --help
git add titi
=> you should have the add achievement level 1 and you don't...