Update version number and add JSON string escape

composer.json

@@ -2,7 +2,7 @@
     "name": "nwb/multi-downloader-client",
     "description": "Client for multi-downloader-service",
     "type": "library",
-    "version": "0.0.6",
+    "version": "0.0.7",
     "autoload": {
         "psr-4": {
             "Nwb\\MultiDownloaderClient\\": "src/"
@@ -24,4 +24,4 @@
     "scripts": {
         "test": "phpunit"
     }
-}
+}