fix(deps): update dependency typescript to v3.1.2

Author: renovate-bot

package-lock.json

@@ -15,7 +15,7 @@
     "tslint": "5.11.0",
     "tslint-consistent-codestyle": "1.13.3",
     "tslint-immutable": "4.8.0",
-    "typescript": "3.1.1"
+    "typescript": "3.1.2"
   },
   "devDependencies": {
     "@ht2-labs/semantic-release": "1.1.29"