Merge pull request #628 from ipfs/greenkeeper-multihashes-0.3.0

Update multihashes to version 0.3.0 🚀

Author: daviddias

package.json

@@ -101,7 +101,7 @@
     "lodash.values": "^4.3.0",
     "mafmt": "^2.1.2",
     "multiaddr": "^2.1.1",
-    "multihashes": "^0.2.2",
+    "multihashes": "^0.3.0",
     "path-exists": "^3.0.0",
     "peer-book": "^0.3.0",
     "peer-id": "^0.8.0",