Switch maildev port from 18083 to 18084
What does this MR do?
Switches the maildev port so it doesn't conflict with one that is sometimes used by vagrant.
How confident are you it won't break things if deployed?
Just dev env only.
Links to related issues
- added a test, or explain why one is not needed/possible...
- no unrelated changes
- asked someone for a code review
- joined #foodsharing-beta channel at https://slackin.yunity.org
- added an entry to CHANGELOG.md (description, merge request link, username(s))