fix(package): update cids to version 0.7.0

BREAKING CHANGE: Returned v1 CIDs now default to base32 encoding

Previous versions returned a base58 encoded string when `toString()`/
`toBaseEncodedString()` was called on a CIDv1. It now returns a base32
encoded string.

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
   "homepage": "https://github.com/ipld/js-ipld-dag-cbor",
   "dependencies": {
     "borc": "^2.1.0",
-    "cids": "~0.6.0",
+    "cids": "~0.7.0",
     "is-circular": "^1.0.2",
     "multicodec": "~0.5.0",
     "multihashing-async": "~0.7.0"