v1.16.3

Sébastiaan Versteeg

@sversteeg

e8ec6a3c · Merge branch 'fix/member-email-tests' into 'master' · Aug 18, 2018

##  :ambulance: Thalia Website v1.16.3

## Errors resolved
- Fix automatic membership emails (!899) ~"members"
- Fix renewal since date calculation (!898) ~"registrations"