Fix dependency constraint

Author: phpbg

composer.json

@@ -20,7 +20,7 @@
     "react/promise": "^2.7",
     "psr/log": "^1.0",
     "myclabs/php-enum": "^1.5",
-    "evenement/evenement": "3.0"
+    "evenement/evenement": "^3.0"
   },
   "autoload": {
     "psr-4": {