chore: create bundle during prepare step

aegir release runs build then npm publish.  npm publish runs prepare
which removes the dist folder and creates type defs.

We need typedefs and the bundle so just run the build step. This will
make building take a little longer.

Author: achingbrain

package.json

@@ -35,7 +35,7 @@
     "url": "git+https://github.com/ipfs/js-ipfs.git"
   },
   "scripts": {
-    "prepare": "aegir build --no-bundle",
+    "prepare": "npm run build",
     "build": "aegir build",
     "test": "aegir test",
     "test:node": "aegir test -t node",