Changes:

- added type-hints
- added returned type-hints in interface (I checked all)

src/Object/Post.php

@@ -1008,7 +1008,7 @@ class Post
 	/**
 	 * @return string
 	 */
-	private function getRedirectUrl()
+	private function getRedirectUrl(): string
 	{
 		return $this->redirect_url;
 	}

src/Object/Search/ContactResult.php

@@ -110,7 +110,7 @@ class ContactResult implements IResult
 	/**
 	 * @return string
 	 */
-	public function getUrl()
+	public function getUrl(): string
 	{
 		return $this->url;
 	}