chore(package): update typescript to version 1.8.7

http://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -40,7 +40,7 @@
     "nyc": "5.6.0",
     "react": "0.14.7",
     "tslint": "3.5.0",
-    "typescript": "1.8.2"
+    "typescript": "1.8.7"
   },
   "dependencies": {
     "babylon": "6.6.0",