Changelog update

Forgot to do this when i added the servicebot stuff.
Merge pull request #2173 from GauHelldragon/master

Changelog!
Hydroponics trays will update icons after being weeded now.
Merge pull request #2174 from GauHelldragon/master

Hydroponics fix
Merge branch 'master' of https://github.com/Baystation12/Baystation12