Tilde version range

[konradmichalik]

I got some problems with version comparisons.

$range = new expression('~4.1');
$range->satisfiedBy(new version('4.9.6')); //false -> should be true

The tilde operator should work like the following example from composer: ~1.2 is equivalent to >=1.2 <2.0.0. It's like you documented in your Readme, but it's actually not working.