Match core to spec (still work to do)

package.json

@@ -7,7 +7,7 @@
     "actions"
   ],
   "author": "Bryan MacFarlane <bryanmac@microsoft.com>",
-  "homepage": "https://github.com/actions/toolkit/tree/master/packages/io",
+  "homepage": "https://github.com/actions/toolkit/tree/master/packages/core",
   "license": "MIT",
   "main": "lib/lib.js",
   "directories": {