Upgrade TS to 3.0.3

We need this specific version because ts-simple-ast depends on it. See
https://github.com/denoland/deno/pull/729#issuecomment-426352887

package.json

@@ -23,6 +23,6 @@
     "tslint": "^5.10.0",
     "tslint-eslint-rules": "^5.3.1",
     "tslint-no-circular-imports": "^0.5.0",
-    "typescript": "3.0.1"
+    "typescript": "3.0.3"
   }
 }

third_party @ d42e8586

-Subproject commit 5bef8d86e9afc8e3718ef8e9f75b486ce717fb42
+Subproject commit d42e858624b2149e46012ac44c50157003bbdded