Update README.md

corrected spacing in the Readme's example code

Author: timothyjellison

README.md

@@ -66,15 +66,15 @@ function MyApp() {
       </ContextMenuTrigger>
 
       <ContextMenu id="some_unique_identifier">
-          <MenuItem data={{foo: 'bar'}} onClick={this.handleClick}>
+        <MenuItem data={{foo: 'bar'}} onClick={this.handleClick}>
           ContextMenu Item 1
         </MenuItem>
         <MenuItem data={{foo: 'bar'}} onClick={this.handleClick}>
           ContextMenu Item 2
         </MenuItem>
         <MenuItem divider />
         <MenuItem data={{foo: 'bar'}} onClick={this.handleClick}>
-   	      ContextMenu Item 3
+          ContextMenu Item 3
         </MenuItem>
       </ContextMenu>