fix(deps): update dependency typescript to v2.7.1

Author: renovate-bot

package-lock.json

@@ -15,7 +15,7 @@
     "tslint": "5.9.1",
     "tslint-consistent-codestyle": "1.11.0",
     "tslint-immutable": "4.5.1",
-    "typescript": "2.6.2"
+    "typescript": "2.7.1"
   },
   "devDependencies": {
     "@ht2-labs/semantic-release": "1.0.26"