Update the rules of recommended config in readme

Just bringing the list up to date with what's currently in the recommended config.

Author: fson

README.md

@@ -167,12 +167,12 @@ The rules enabled in this configuration are:
 * [react/jsx-no-undef](docs/rules/jsx-no-undef.md)
 * [react/jsx-uses-react](docs/rules/jsx-uses-react.md)
 * [react/jsx-uses-vars](docs/rules/jsx-uses-vars.md)
-* [react/no-danger](docs/rules/no-danger.md)
 * [react/no-deprecated](docs/rules/no-deprecated.md)
 * [react/no-direct-mutation-state](docs/rules/no-direct-mutation-state.md)
 * [react/no-find-dom-node](docs/rules/no-find-dom-node.md)
 * [react/no-is-mounted](docs/rules/no-is-mounted.md)
 * [react/no-unknown-property](docs/rules/no-unknown-property.md)
+* [react/no-render-return-value](docs/rules/no-render-return-value.md)
 * [react/prop-types](docs/rules/prop-types.md)
 * [react/react-in-jsx-scope](docs/rules/react-in-jsx-scope.md)
 * [react/require-render-return](docs/rules/require-render-return.md)