[Docs] add jsx-curly-newline to README

Author: golopot

README.md

@@ -153,6 +153,7 @@ Enable the rules that you would like to use.
 * [react/jsx-child-element-spacing](docs/rules/jsx-child-element-spacing.md): Enforce or disallow spaces inside of curly braces in JSX attributes and expressions.
 * [react/jsx-closing-bracket-location](docs/rules/jsx-closing-bracket-location.md): Validate closing bracket location in JSX (fixable)
 * [react/jsx-closing-tag-location](docs/rules/jsx-closing-tag-location.md): Validate closing tag location in JSX (fixable)
+* [react/jsx-curly-newline](docs/rules/jsx-curly-newline.md): Enforce or disallow newlines inside of curly braces in JSX attributes and expressions (fixable)
 * [react/jsx-curly-spacing](docs/rules/jsx-curly-spacing.md): Enforce or disallow spaces inside of curly braces in JSX attributes and expressions (fixable)
 * [react/jsx-equals-spacing](docs/rules/jsx-equals-spacing.md): Enforce or disallow spaces around equal signs in JSX attributes (fixable)
 * [react/jsx-filename-extension](docs/rules/jsx-filename-extension.md): Restrict file extensions that may contain JSX