Merge pull request #22 from angelov/symfony-4

Allow installation of  Stopwatch/Event Dispatcher v4

Author: ikwattro

composer.json

@@ -12,9 +12,9 @@
     "require": {
         "php": "^7.0",
         "graphaware/neo4j-php-client": "^4.0",
-        "symfony/event-dispatcher": "^2.7 || ^3.0",
+        "symfony/event-dispatcher": "^2.7 || ^3.0 || ^4.0",
         "psr/log": "^1.0",
-        "symfony/stopwatch": "^2.7 || ^3.0"
+        "symfony/stopwatch": "^2.7 || ^3.0 || ^4.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.1"