chore(package): update dependencies (#3)

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -16,9 +16,9 @@
   "license": "MIT",
   "dependencies": {},
   "devDependencies": {
-    "istanbul": "^0.3.5",
+    "istanbul": "^0.4.5",
     "make-lint": "^1.0.1",
-    "mocha": "^2.0.1"
+    "mocha": "^3.1.2"
   },
   "files": [
     "README.md",