replace symfony/json-encoder with symfony/json-streamer (#34)

Author: xabbuh

composer.json

@@ -22,7 +22,7 @@
         "symfony/html-sanitizer": "*",
         "symfony/http-client": "*",
         "symfony/intl": "*",
-        "symfony/json-encoder": "*",
+        "symfony/json-streamer": "*",
         "symfony/lock": "*",
         "symfony/mailer": "*",
         "symfony/mercure-bundle": "^0.3.2",