Document pjax:beforeReplace event

Author: mislav

README.md

@@ -230,6 +230,12 @@ container, not the link that was clicked.
   <td><code>options</code></td>
   <td>fires after pjax has started from a link that got clicked</td>
 </tr>
+<tr>
+  <td><code>pjax:beforeReplace</code></td>
+  <td></td>
+  <td><code>contents, options</code></td>
+  <td>before replacing HTML with content loaded from the server</td>
+</tr>
 <tr>
   <td><code>pjax:success</code></td>
   <td></td>
@@ -275,6 +281,12 @@ container, not the link that was clicked.
   <td><code>null, options</code></td>
   <td>before replacing content</td>
 </tr>
+<tr>
+  <td><code>pjax:beforeReplace</code></td>
+  <td></td>
+  <td><code>contents, options</code></td>
+  <td>right before replacing HTML with content from cache</td>
+</tr>
 <tr>
   <td><code>pjax:end</code></td>
   <td></td>