Changed version to v.1.9.9

Author: gnongsie

composer.json

@@ -3,6 +3,6 @@
   "php": ">=5.6",
   "ext-curl": "*",
   "phpunit/phpunit": "~4.8||~6.0",
-  "authorizenet/authorizenet": ">=1.9.8 || <2.0" 
+  "authorizenet/authorizenet": ">=1.9.9 || <2.0" 
   }
 }