fix(build): point to the transpiled version

Author: daviddias

package.json

@@ -2,7 +2,7 @@
   "name": "interface-ipfs-core",
   "version": "0.14.2",
   "description": "A test suite and interface you can use to implement a IPFS core interface.",
-  "main": "src/index.js",
+  "main": "lib/index.js",
   "jsnext:main": "src/index.js",
   "scripts": {
     "test": "exit(0)",
@@ -50,4 +50,4 @@
     "greenkeeperio-bot <support@greenkeeper.io>",
     "nginnever <ginneversource@gmail.com>"
   ]
-}
+}