fix: restore browser bundle

It is documented in
https://github.com/ipfs-shipyard/is-ipfs#in-the-browser-through-script-tag

License: MIT
Signed-off-by: Marcin Rataj <[email protected]>

Author: lidel

package.json

@@ -34,6 +34,7 @@
     "test:node": "aegir test --target node",
     "test:browser": "aegir test --target browser",
     "test": "aegir test",
+    "prepublishOnly": "aegir build",
     "lint": "aegir lint && aegir lint-package-json",
     "release": "aegir release",
     "release-minor": "aegir release --type minor",