Handle private messages to other people from other clients slightly better

package.json

@@ -13,7 +13,7 @@
 		"colors": "1.1.x",
 		"commander": "2.12.x",
 		"escape-html": "1.0.x",
-		"file-type": "^7.3.0",
+		"file-type": "7.4.x",
 		"marked": "0.3.x",
 		"matrix-appservice-bridge": "1.x.x",
 		"matrix-js-sdk": "0.x.x",
@@ -24,7 +24,7 @@
 		"yamljs": "0.3.x"
 	},
 	"devDependencies": {
-		"eslint": "4.12.x",
+		"eslint": "4.13.x",
 		"eslint-config-airbnb-base": "12.1.x",
 		"eslint-plugin-import": "2.8.x",
 		"jsdoc": "3.5.x"