Update dependency typescript to v3.0.3 (#46)

Author: renovate[bot]

package-lock.json

@@ -44,7 +44,7 @@
     "rimraf": "2.6.2",
     "rollup": "0.65.0",
     "tslint": "5.11.0",
-    "typescript": "3.0.1"
+    "typescript": "3.0.3"
   },
   "files": [
     "dist/index.js",