Long version refactor

[krzysztofrewak]

I think differences here could be more verbose:

$version = (new Version())->generate();
$version = (new Version(true))->generate();

Maybe this would be better?

$version = (new Version())->generate();
$version = (new LongVersion())->generate();

Also: 35. and 38. line in src/Version.php are repeated. If you're using long version, you shouldn't run normal one, I think.