Add routing-sf4.xml to remove Symfony >4.1 deprecation

Author: tobias-93

Resources/config/routing/routing-sf4.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<routes xmlns="http://symfony.com/schema/routing"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://symfony.com/schema/routing http://symfony.com/schema/routing/routing-1.0.xsd">
+
+    <route id="fos_js_routing_js" path="/js/routing.{_format}" methods="GET">
+        <default key="_controller">fos_js_routing.controller::indexAction</default>
+        <default key="_format">js</default>
+        <requirement key="_format">js|json</requirement>
+    </route>
+</routes>

Resources/doc/installation.rst

@@ -45,15 +45,18 @@ in the ``app/AppKernel.php`` file of your project:
 Step 3: Register the Routes
 ---------------------------
 
-Load the bundle's routing definition in the application (usually in the
-``app/config/routing.yml`` file):
+Load the bundle's routing definition in the application:
 
 .. code-block:: yaml
 
-    # app/config/routing.yml
+    # Symfony 2 + 3: app/config/routing.yml
     fos_js_routing:
         resource: "@FOSJsRoutingBundle/Resources/config/routing/routing.xml"
 
+    # Symfony 4: config/routes/fos_js_routing.yml
+    fos_js_routing:
+        resource: "@FOSJsRoutingBundle/Resources/config/routing/routing-sf4.xml"
+
 Step 4: Publish the Assets
 --------------------------
 
@@ -64,7 +67,7 @@ Execute the following command to publish the assets required by the bundle:
     # Symfony 2
     $ php app/console assets:install --symlink web
 
-    # Symfony 3
+    # Symfony 3 + 4
     $ php bin/console assets:install --symlink web
 
 .. _`installation chapter`: https://getcomposer.org/doc/00-intro.md