Add support for replacing with a list of nodes

Author: wooorm

Diff for: index.js

@@ -65,7 +65,7 @@ function findAndReplace(tree, find, replace, options) {
           }
 
           if (value) {
-            nodes.push(value)
+            nodes = [].concat(nodes, value)
           }
 
           start = position + match[0].length

Diff for: readme.md

@@ -88,8 +88,9 @@ Partial matches are not supported.
     — Value to insert.
     When `string`, turned into a [`Text`][text] node.
     When `Function`, invoked with the results of calling `RegExp.exec` as
-    arguments, in which case it can return a [`Node`][node], a `string` (which
-    is wrapped in a [`Text`][text] node), or `false` to not replace
+    arguments, in which case it can return a single or a list of [`Node`][node],
+    a `string` (which is wrapped in a [`Text`][text] node), or `false` to not
+    replace
 *   `search` (`Object` or `Array`)
     — Perform multiple find-and-replaces.
     When `Array`, each entry is a tuple (`Array`) of a `find` (at `0`) and