Bugfixes and optimisations.

- Fix for __invoke methods (issue: #429)
- Fixed not being able to parse body of PUT request.
- BaseCsrfVerifier expects the field name to be "csrf-token" (issue: #432)
- Minor optimisations

src/Pecee/Http/Middleware/BaseCsrfVerifier.php

@@ -9,7 +9,7 @@ use Pecee\Http\Security\ITokenProvider;
 
 class BaseCsrfVerifier implements IMiddleware
 {
-    public const POST_KEY = 'csrf-token';
+    public const POST_KEY = 'csrf_token';
     public const HEADER_KEY = 'X-CSRF-TOKEN';
 
     protected $except;