Update updateCardCustomField method to use send request as JSON with body

Author: stevenmaguire

CHANGELOG.md

@@ -2,6 +2,23 @@
 
 All Notable changes to `trello-php` will be documented in this file
 
+## 0.5.3 - 2018-03-28
+
+### Added
+- Nothing
+
+### Deprecated
+- Nothing
+
+### Fixed
+- Update updateCardCustomField method to use send request as JSON with body
+
+### Removed
+- Nothing
+
+### Security
+- Nothing
+
 ## 0.5.2 - 2018-03-26
 
 ### Added

src/Http.php

@@ -240,7 +240,8 @@ public function put($path, $parameters)
     public function putAsBody($path, $parameters)
     {
         $request = $this->getRequest(static::HTTP_PUT, $path)
-            ->withBody(Psr7\stream_for(json_encode($parameters)));
+            ->withBody(Psr7\stream_for(json_encode($parameters)))
+            ->withHeader('content-type', 'application/json');
 
         return $this->sendRequest($request);
     }