Update dependency typescript to v3.7.3 (#241)

Author: renovate-bot

package.json

@@ -55,7 +55,7 @@
     "rollup": "0.67.4",
     "rollup-plugin-copy": "3.1.0",
     "tslint": "5.20.1",
-    "typescript": "3.7.2"
+    "typescript": "3.7.3"
   },
   "lint-staged": {
     "*.ts": [