chore: update ipfs-api

Author: daviddias

package.json

@@ -105,7 +105,7 @@
     "hapi": "^16.6.2",
     "hapi-set-header": "^1.0.2",
     "hoek": "^5.0.0",
-    "ipfs-api": "^14.3.7",
+    "ipfs-api": "^15.0.0",
     "interface-datastore": "^0.3.0",
     "ipfs-bitswap": "~0.17.2",
     "ipfs-block": "~0.6.0",