Update dependency typescript to v3.1.3 (#85)

Author: renovate-bot

package-lock.json

@@ -44,7 +44,7 @@
     "rimraf": "2.6.2",
     "rollup": "0.66.6",
     "tslint": "5.11.0",
-    "typescript": "3.1.2"
+    "typescript": "3.1.3"
   },
   "files": [
     "dist/index.js",