chore: update deps

Author: daviddias

package.json

@@ -62,7 +62,7 @@
     "left-pad": "^1.1.3",
     "lodash": "^4.17.4",
     "multihashes": "^0.4.5",
-    "multihashing-async": "^0.4.0",
+    "multihashing-async": "^0.4.5",
     "pull-batch": "^1.0.0",
     "pull-block": "^1.1.0",
     "pull-cat": "^1.1.11",