fix typo in content type

lib/public/appframework/http/jsonresponse.php

@@ -49,7 +49,7 @@ class JSONResponse extends Response {
 	public function __construct($data=array(), $statusCode=Http::STATUS_OK) {
 		$this->data = $data;
 		$this->setStatus($statusCode);
-		$this->addHeader('Content-type', 'application/json; charset=utf-8');
+		$this->addHeader('Content-Type', 'application/json; charset=utf-8');
 	}
 
 

tests/lib/appframework/http/JSONResponseTest.php

@@ -44,7 +44,7 @@ class JSONResponseTest extends \PHPUnit_Framework_TestCase {
 
 	public function testHeader() {
 		$headers = $this->json->getHeaders();
-		$this->assertEquals('application/json; charset=utf-8', $headers['Content-type']);
+		$this->assertEquals('application/json; charset=utf-8', $headers['Content-Type']);
 	}