* Merge branch &39;master&39; into update_phonenumbers
* downgraded more-itertools to 5.0.0
* downgraded pytest to 3.7.0
* made phonenumbers version >=8.11.0 and <8.12.0 ([`80b9257`](https://github.com/ocadotechnology/codeforlife-portal/commit/80b92571df7774e29edd1a73b4f706c36acda49d))