Fix exception parameter, update README

Author: martijndeb

README.md

@@ -45,7 +45,9 @@ Objects like Post or Collection will update automagically after calling a save/g
 
 Authentication is done on the Context. If you want to authenticate multiple users for some reason, use multiple contexts. Upon logging in you should store the access token for future sessions. Logout when you need to, don't keep tokens layout around.
 
-# Work in progress
+All errors are transformed to WAException objects, which are catchable.
+
+# Supports the following api endpoints (near) completely
 
 - [x] Authentication
 - [x] Posts

lib/Context.php

@@ -69,8 +69,6 @@ public function request( string $url, ?string $postdata = null, ?string $customR
 
 		if ( (int) $statusCode >= 400 ) {
 			throw new WAException( null, $statusCode );
-
-			return null;
 		}
 
 		if ( $output !== false && !empty( $output ) ) {

lib/WAException.php

@@ -18,7 +18,7 @@ class WAException extends \Exception
 		503 => "Server Error"
 	);
 
-	function __construct( $message = null, $code = 0, Exception $previous = null )
+	function __construct( $message = null, $code = 0, \Exception $previous = null )
 	{
 		if ( isset( $this->exceptions[ $code ] ) ) {
 			$message = $this->exceptions[ $code ];