fix: ts types after multihashing-async release (ipfs#3529)

The new types in multihashing-async are unsurprisingly stricter than using no types at all.

fixes ipfs#3527

Author: achingbrain

package.json

@@ -13,7 +13,7 @@
   },
   "devDependencies": {
     "rimraf": "^3.0.2",
-    "test-ipfs-example": "^2.0.3"
+    "test-ipfs-example": "^3.0.0"
   },
   "scripts": {
     "start": "react-scripts start",