:new: Add a spec about ignoredMessageTypes config
:new: Add a spec about ignoredMessageTypes config

blakeembrey/linter,Arcanemagus/linter,atom-community/linter,JohnMurga/linter,e-jigsaw/Linter,steelbrain/linter,shawninder/linter,UltCombo/linter,AsaAyers/linter,levity/linter,AtomLinter/Linter,DanPurdy/linter