chore: update deps

Author: achingbrain

package.json

@@ -56,7 +56,7 @@
     "cids": "~0.5.5",
     "deep-extend": "~0.6.0",
     "ipfs-unixfs": "~0.1.15",
-    "ipld": "~0.17.3",
+    "ipld": "~0.18.0",
     "ipld-dag-pb": "~0.14.6",
     "left-pad": "^1.3.0",
     "lodash": "^4.17.11",