Added support for PHP7

tests/Pecee/SimpleRouter/Dummy/Middleware/RewriteMiddleware.php

@@ -0,0 +1,16 @@
+<?php
+
+use Pecee\Http\Middleware\IMiddleware;
+use Pecee\Http\Request;
+
+class RewriteMiddleware implements IMiddleware {
+
+    public function handle(Request $request)  : void {
+
+        $request->setRewriteCallback(function() {
+            return 'ok';
+        });
+
+    }
+
+}