Merge pull request #72 from KnisterPeter/greenkeeper-typescript-1.8.9

Update typescript to version 1.8.9 🚀

Author: KnisterPeter

package.json

@@ -46,7 +46,7 @@
     "nyc": "6.1.1",
     "react": "0.14.7",
     "tslint": "3.6.0",
-    "typescript": "1.8.7"
+    "typescript": "1.8.9"
   },
   "dependencies": {
     "babylon": "6.7.0",