Issue with tilde constraint

[cagataygurturk]

It seems that there is an issue with tilde constraints. Version "0.1.0" matches "~0.0.0" although it should not.

Adding the following test cases causes a failure:

https://github.com/cagataygurturk/semver/commit/32e10671da3fbb7110f79679587e6799945c27ef#diff-38863e0a01899c69c60ca35df3a357eb9839bc41ea818352ee5240c728234920

Thanks.

[mattfarina]

Thanks for catching this issue.

[mattfarina]

I did a little looking. According to the internal code comments...

// ~0.0.0 is a special case where all constraints are accepted. It's
// equivalent to >= 0.0.0.

This is intentional behavior that came from v1. While I would like to change this it would mean a v4 of this package because it's following the intent.

I'm changing this to an enhancement so that when v4 is released we can incorporate it.

[mattfarina]

Note, I do not remember by ~0.0.0 is a special case. I wish I did. Better comments would have helped.