fix(deps): Updates typescript.

Author: ryasmi

package-lock.json

@@ -15,7 +15,7 @@
     "tslint": "^5.9.1",
     "tslint-consistent-codestyle": "^1.11.1",
     "tslint-immutable": "^4.5.1",
-    "typescript": "^2.7.1"
+    "typescript": "^2.8.1"
   },
   "devDependencies": {
     "@ht2-labs/semantic-release": "1.0.31"