Forward compatibility with goaop/framework 3.0.

Author: ddinchev

src/AspectMock/Intercept/BeforeMockTransformer.php

@@ -11,7 +11,7 @@ class BeforeMockTransformer extends WeavingTransformer
     protected $before = " if ((\$__am_res = __amock_before(\$this, __CLASS__, __FUNCTION__, array(%s), false)) !== __AM_CONTINUE__) return \$__am_res; ";
     protected $beforeStatic = " if ((\$__am_res = __amock_before(get_called_class(), __CLASS__, __FUNCTION__, array(%s), true)) !== __AM_CONTINUE__) return \$__am_res; ";
 
-    public function transform(StreamMetaData $metadata)
+    public function transform(StreamMetaData $metadata): string
     {
         $result        = self::RESULT_ABSTAIN;
         $reflectedFile = new ReflectionFile($metadata->uri, $metadata->syntaxTree);

src/AspectMock/Kernel.php

@@ -58,7 +58,7 @@ public function loadFile($file)
         include FilterInjectorTransformer::rewrite($file);
     }
 
-    protected function registerTransformers()
+    protected function registerTransformers(): array
     {
         $cachePathManager = $this->getContainer()->get('aspect.cache.path.manager');;