chore: build bundle during prepublishOnly phase

Author: achingbrain

package.json

@@ -35,7 +35,7 @@
     "url": "git+https://github.com/ipfs/js-ipfs.git"
   },
   "scripts": {
-    "build": "aegir build",
+    "prepublishOnly": "aegir build",
     "test": "aegir test",
     "test:node": "aegir test -t node",
     "test:browser": "aegir test -t browser",