chore(deps): update dependency typescript to v3.9.7 (#176)

Co-authored-by: Huy Pham <[email protected]>
Co-authored-by: Grant Timmerman <[email protected]>

Author: 3 people

package-lock.json

@@ -47,6 +47,6 @@
     "mocha": "6.1.4",
     "power-assert": "1.6.1",
     "supertest": "3.4.2",
-    "typescript": "3.5.1"
+    "typescript": "3.9.7"
   }
 }