change onBeforeInput to take data property

lib/components/content.js

@@ -37,6 +37,7 @@ class Content extends React.Component {
     className: React.PropTypes.string,
     editor: React.PropTypes.object.isRequired,
     onBeforeInput: React.PropTypes.func.isRequired,
+    onBlur: React.PropTypes.func.isRequired,
     onChange: React.PropTypes.func.isRequired,
     onKeyDown: React.PropTypes.func.isRequired,
     onPaste: React.PropTypes.func.isRequired,
@@ -153,7 +154,9 @@ class Content extends React.Component {
 
   onBeforeInput = (e) => {
     if (this.props.readOnly) return
-    this.props.onBeforeInput(e)
+
+    const data = {}
+    this.props.onBeforeInput(e, data)
   }
 
   /**

lib/plugins/core.js

@@ -70,12 +70,13 @@ function Plugin(options = {}) {
    * input behavior, to avoid a re-render for performance.
    *
    * @param {Event} e
+   * @param {Object} data
    * @param {State} state
    * @param {Editor} editor
    * @return {State}
    */
 
-  function onBeforeInput(e, state, editor) {
+  function onBeforeInput(e, data, state, editor) {
     const { renderDecorations } = editor
     const { startOffset, startText, startBlock } = state