chore: revert recent update of typescript until typescript-estree officially supports (warnings during testing)

Author: brettz9

package.json

@@ -33,7 +33,7 @@
     "mocha": "^6.2.0",
     "nyc": "^14.1.1",
     "semantic-release": "^15.13.24",
-    "typescript": "^3.6.2"
+    "typescript": "^3.5.3"
   },
   "engines": {
     "node": ">=6"