revert: feat(frontend): update typescript to 2.4.1

Author: kucharzyk

shardis-frontend/package.json

@@ -62,7 +62,7 @@
     "rimraf": "2.6.1",
     "ts-node": "3.1.0",
     "tslint": "5.4.3",
-    "typescript": "2.4.1",
+    "typescript": "2.3.4",
     "yarn": "0.24.6"
   },
   "scripts": {