Symfony 4 + Flex support

Author: mhujer

composer.json

@@ -1,6 +1,6 @@
 {
 	"name": "mhujer/javascript-error-handler-bundle",
-	"type": "library",
+	"type": "symfony-bundle",
 	"description": "Converts JavaScript errors to alerts, so you won't miss them if you don't have the browser console open.",
 	"keywords": [
 		"javascript",
@@ -18,7 +18,12 @@
 	],
 	"require": {
 		"php": "7.1.*||7.2.*",
-		"symfony/symfony": "~3.3|~4.0"
+		"symfony/config": "^3.3|^4.0",
+		"symfony/dependency-injection": "^3.3|^4.0",
+		"symfony/event-dispatcher": "^3.3|^4.0",
+		"symfony/expression-language": "^3.3|^4.0",
+		"symfony/http-foundation": "^3.3|^4.0",
+		"symfony/http-kernel": "^3.3|^4.0"
 	},
 	"require-dev": {
 		"consistence/coding-standard": "2.2.1",