Made mapper requirement a little less strict

Author: Dirk Scholten

composer.json

@@ -18,7 +18,7 @@
         "php": ">=7.2",
         "ext-ctype": "*",
         "ext-iconv": "*",
-        "comsave/salesforce-mapper-bundle": "3.5.0",
+        "comsave/salesforce-mapper-bundle": "^3.5",
         "php-amqplib/rabbitmq-bundle": "^1.14",
         "symfony/config": "^3.4|^4.3",
         "symfony/console": "^3.4|^4.3",