Add scope filter to getClaims()

[alecpl]

Fixes #22.

[coffe4u]

This introduces a breaking change. Anyone who implements the IdentityEntityInterface or Claimable interface will need to update the getClaims() method. This broke on production instances for us today.

[jeremy379]

I'll revert and introduce that change in a new version

[jeremy379]

After more check, I already used a 2.4.0 version (upgrading from 2.3.3)

You can force the version 2.3.*

I've also documented the breaking change.

[coffe4u]

I guess I was expecting Semantic Versioning. Increasing the middle number usually indicates new features. Breaking changes usually increases the first number. Not that big of a deal. I was able to fix it in my implementation in just a couple of minutes. Thanks for documenting it!