Update @types/screeps to 3.1.0

package.json

@@ -38,7 +38,7 @@
     "@types/lodash": "^3.10.1",
     "@types/mocha": "^5.2.5",
     "@types/node": "^10.17.18",
-    "@types/screeps": "^3.0.0",
+    "@types/screeps": "^3.1.0",
     "@types/sinon": "^5.0.5",
     "@types/sinon-chai": "^3.2.0",
     "chai": "^4.2.0",