chore(package): update multihashes to version 0.3.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -35,7 +35,7 @@
     "ipfs-block": "^0.5.0",
     "ipld-dag-pb": "^0.9.0",
     "multiaddr": "^2.1.1",
-    "multihashes": "^0.2.2",
+    "multihashes": "^0.3.0",
     "readable-stream": "2.1.5"
   },
   "devDependencies": {