Tell Atom's spell-checker to shut the fuck up

No idea what atom/spell-check#314 did, but the package is now griping at
startup about missing dictionaries, even though it's working fine (words
like "colour" are recognised, and "color" is marked as a misspelling).

config.cson

@@ -123,6 +123,7 @@
 			"text.srt"
 			"text.xml"
 		]
+		noticesMode: "console"
 	"status-bar":
 		fullWidth: false
 	tabs: {}