Merge pull request reduxjs#580 from nicolo-ribaudo/docs-connectAdv

Add the link to connectAdvanced to docs/README.md

Author: markerikson

docs/README.md

@@ -4,4 +4,5 @@
 - [API](api.md#api)
   - [`<Provider store>`](api.md#provider-store)
   - [`connect([mapStateToProps], [mapDispatchToProps], [mergeProps], [options])`](api.md#connectmapstatetoprops-mapdispatchtoprops-mergeprops-options)
+  - [`connectAdvanced(selectorFactory, [connectOptions])`](api.md#connectadvancedselectorfactory-connectoptions)
 - [Troubleshooting](troubleshooting.md#troubleshooting)