Added test for getting an error message from RestJsonError (#175)

* Added test for getting an error message from RestJsonError

* cs

* Added more tests

* Added more tests

* Bugfix

* Update deps

* Adding symfony-framework to control lowest version

* Adding flex

* Fixes

* update deps

* Ignore deprecation warnings on "lowest"

* Moved env

Author: Nyholm

composer.json

@@ -20,7 +20,7 @@
         "async-aws/s3": "^0.1",
         "async-aws/ses": "^0.1",
         "async-aws/sqs": "^0.1",
-        "matthiasnoback/symfony-config-test": "^4.0",
+        "matthiasnoback/symfony-config-test": "^4.1",
         "nyholm/symfony-bundle-test": "^1.6.1"
     },
     "extra": {