Bump fractal version to development one.

composer.json

@@ -25,6 +25,10 @@
         {
             "type": "vcs",
             "url":  "https://github.com/alchemy-fr/embed-bundle.git"
+        },
+        {
+            "type": "git",
+            "url":  "https://github.com/bburnichon/fractal.git"
         }
     ],
     "require":      {
@@ -38,7 +42,7 @@
         "alchemy/oauth2php": "1.0.0",
         "alchemy/phlickr": "0.2.9",
         "alchemy/phpexiftool": "^0.5.0",
-        "alchemy/rest-bundle": "^0.0.4",
+        "alchemy/rest-bundle": "^0.0.5",
         "alchemy/symfony-cors": "^0.1.0",
         "alchemy/task-manager": "2.0.x-dev@dev",
         "alchemy/zippy": "^0.3.0",
@@ -69,6 +73,7 @@
         "justinrainbow/json-schema": "2.0.3 as 1.6.1",
         "league/flysystem": "^1.0",
         "league/flysystem-aws-s3-v2": "^1.0",
+        "league/fractal": "dev-bug/null-resource-serialization#d84aa1e as 0.13.0",
         "media-alchemyst/media-alchemyst": "^0.5",
         "monolog/monolog": "~1.3",
         "mrclay/minify": "~2.1.6",