chore(package): update @types/gm to version 1.17.31

package.json

@@ -33,7 +33,7 @@
 		"@types/elasticsearch": "5.0.13",
 		"@types/event-stream": "3.3.31",
 		"@types/express": "4.0.35",
-		"@types/gm": "1.17.30",
+		"@types/gm": "1.17.31",
 		"@types/gulp": "4.0.3",
 		"@types/gulp-mocha": "0.0.30",
 		"@types/gulp-rename": "0.0.32",