Small fixes (#81)

* PHPUnit > Add `name` attribute to `testsuite` element

* Bump minimum `jms/serializer` version

* Bump minimum `simple-bus/message-bus` version

* Fix wrong version constraint

Author: ruudk

composer.json

@@ -27,7 +27,7 @@
     ],
     "require": {
         "php": "^7.3",
-        "simple-bus/message-bus": "^3.0",
+        "simple-bus/message-bus": "^3.0.3",
         "symfony/config": "^4.4 || ^5.0",
         "symfony/dependency-injection": "^4.4 || ^5.0",
         "symfony/http-kernel": "^4.4 || ^5.0",

phpunit.xml.dist

@@ -16,7 +16,7 @@
     </php>
 
     <testsuites>
-        <testsuite>
+        <testsuite name="Everything">
             <directory>./tests/</directory>
         </testsuite>
     </testsuites>