Update dependency typescript to v3.8.3 (#43)

Author: renovate-bot

package.json

@@ -49,7 +49,7 @@
     "rollup": "2.0.0",
     "shx": "0.3.2",
     "tslib": "1.11.1",
-    "typescript": "3.8.2"
+    "typescript": "3.8.3"
   },
   "volta": {
     "node": "12.16.1",