fix: update to latest TS for dependencies

Author: andnp

package.json

@@ -42,7 +42,7 @@
     "ts-jest": "^23.0.0",
     "ts-node": "^7.0.0",
     "tslint": "^5.9.1",
-    "typescript": "~2.8.1"
+    "typescript": "^3.2.4"
   },
   "commitlint": {
     "extends": [