use v3.1.0 of typescript-formatter

It is now less eager to insert trailing newlines

package.json

@@ -89,7 +89,7 @@
     "source-map": "^0.4.4",
     "tslint": "^3.3.0",
     "typescript": "^2.0.3",
-    "typescript-formatter": "git+https://github.com/jrieken/typescript-formatter.git#560ea3b",
+    "typescript-formatter": "3.1.0",
     "uglify-js": "2.4.8",
     "underscore": "^1.8.2",
     "vinyl": "^0.4.5",
@@ -113,4 +113,4 @@
     "windows-mutex": "^0.2.0",
     "fsevents": "0.3.8"
   }
-}
+}