Made phone_number_verified be boolean.

[rohe]

Fixed bug where loading non-boolean worked for something marked as boolean.
Added tests.

Thanks for contributing to this library! Please include the following check
list in your pull request submission (you can delete this message). If your
changes don't need a change log or documentation update, please ignore this.

• Any changes relevant to users are recorded in the CHANGELOG.md.
• The documentation has been updated, if necessary.

---

[rohe]

This replaces PR #408

[coveralls]

Coverage increased (+0.01%) to 59.867% when pulling aeefc09 on rohe:claim_boolean into 6b56e7d on OpenIDC:master.

[coveralls]

Coverage increased (+0.01%) to 59.867% when pulling aeefc09 on rohe:claim_boolean into 6b56e7d on OpenIDC:master.

[coveralls]

Coverage increased (+0.01%) to 59.867% when pulling aeefc09 on rohe:claim_boolean into 6b56e7d on OpenIDC:master.

[coveralls]

Coverage increased (+0.01%) to 59.867% when pulling aeefc09 on rohe:claim_boolean into 6b56e7d on OpenIDC:master.

[coveralls]

Coverage increased (+0.004%) to 59.86% when pulling 5258930 on rohe:claim_boolean into 6b56e7d on OpenIDC:master.

[coveralls]

Coverage increased (+0.01%) to 59.867% when pulling 5258930 on rohe:claim_boolean into 6b56e7d on OpenIDC:master.

[decentral1se]

LGTM 🍻 🍻 🍻