Bump app-validator

+ Add `contacts` permission

requirements/prod.txt

@@ -82,7 +82,7 @@ tower==0.3.4
 
 ## Not on pypi.
 -e git://github.com/mozilla/amo-validator.git@8c5cd0285ef0efe25c706454c4a41fbaa0694427#egg=amo-validator
--e git://github.com/mozilla/app-validator.git@16e72d5490c2a913c6519f819ff41945fdf010a3#egg=app-validator
+-e git://github.com/mozilla/app-validator.git@6213473f5f77499acf11b8aee187431a03d0d991#egg=app-validator
 -e git://github.com/jsocol/commonware.git@27646ecaca40a89024cc581c3ecf5eb0fa87ee11#egg=commonware
 -e git://github.com/jbalogh/django-queryset-transform@a1ba6ae41bd86f5bb9ff66fb56614e0fafe6e022#egg=django-queryset-transform
 -e git://github.com/miracle2k/django-tables.git@546f339308103880c823b2056830fcdc9220edd0#egg=django-tables