Fixed deps

Author: mmoreram

Diff for: .gitignore

@@ -1,2 +1,3 @@
 vendor
-.php_cs.cache
+.php_cs.cache
+composer.lock

Diff for: composer.json

@@ -12,17 +12,14 @@
     "require": {
         "php": ">=7.1",
 
-        "symfony/http-kernel": "*",
-        "apisearch-io/symfony-async-http-kernel": "dev-master",
-        "react/http": "*",
-        "react/event-loop": "*",
-        "react/socket": "*",
-        "react/promise": "*"
+        "symfony/http-kernel": "^4.2",
+        "react/http": "^0.8",
+        "react/event-loop": "^1",
+        "react/socket": "^1",
+        "react/promise": "^2"
     },
-    "require-dev": {
-        "phpunit/phpunit": "^7.0.0",
-        "mmoreram/php-formatter": "^1.3.1",
-        "friendsofphp/php-cs-fixer": "^2.5.0"
+    "suggest": {
+        "apisearch-io/symfony-async-http-kernel": "To enable --non-blocking flag and work with Async Kernel"
     },
     "autoload": {
         "psr-4": {