update gx package.json.

package.json

@@ -2,7 +2,7 @@
   "author": "whyrusleeping",
   "bugs": {},
   "gx": {
-    "dvcsimport": "github.com/whyrusleeping/mafmt"
+    "dvcsimport": "github.com/multiformats/go-multiaddr-fmt"
   },
   "gxDependencies": [
     {
@@ -10,14 +10,20 @@
       "hash": "QmTZBfrPJmjWsCvHEtX5FE6KimVJhsJg5sBbqEFYf4UZtL",
       "name": "go-multiaddr",
       "version": "1.4.1"
+    },
+    {
+      "author": "lgierth",
+      "hash": "QmR1T4gAM6XCHQugKnPZgZVPzo8WkuvSpL57EKQFgFbwfd",
+      "name": "go-multiaddr-dns",
+      "version": "0.3.2"
     }
   ],
   "gxVersion": "0.6.0",
   "gx_version": "0.4.0",
-  "issues_url": "https://github.com/whyrusleeping/mafmt",
+  "issues_url": "https://github.com/multiformats/go-multiaddr-fmt",
   "language": "go",
   "license": "",
-  "name": "mafmt",
+  "name": "go-multiaddr-fmt",
   "releaseCmd": "git commit -a -m \"gx publish $VERSION\"",
   "version": "1.2.11"
 }