chore: upgrade ipld-dag-cbor to 0.13.0 (#379)

This 0.13.0 ipld-dag-dbor release contains breaking changes
hence special care is needed.

Author: vmx

js/src/dag/get.js

@@ -73,7 +73,7 @@ module.exports = (createCommon, options) => {
         (cb) => {
           nodeCbor = {
             someData: 'I am inside a Cbor object',
-            pb: { '/': cidPb.toBaseEncodedString() }
+            pb: cidPb
           }
 
           dagCBOR.util.cid(nodeCbor, (err, cid) => {

js/src/dag/tree.js

@@ -58,7 +58,7 @@ module.exports = (createCommon, options) => {
         (cb) => {
           nodeCbor = {
             someData: 'I am inside a Cbor object',
-            pb: { '/': cidPb.toBaseEncodedString() }
+            pb: cidPb
           }
 
           dagCBOR.util.cid(nodeCbor, (err, cid) => {

package.json

@@ -43,7 +43,7 @@
     "hat": "0.0.3",
     "ipfs-block": "~0.7.1",
     "ipfs-unixfs": "~0.1.15",
-    "ipld-dag-cbor": "~0.12.1",
+    "ipld-dag-cbor": "~0.13.0",
     "ipld-dag-pb": "~0.14.5",
     "is-ipfs": "~0.4.2",
     "libp2p-crypto": "~0.13.0",