added useful suggest message

Author: transistive

composer.json

@@ -43,7 +43,7 @@
     },
     "suggest": {
         "laudis/neo4j-php-client": "Neo4j-PHP-Client is the most advanced PHP Client for Neo4j",
-        "ext-sockets": "*"
+        "ext-sockets": "Needed when using the Bolt\\connection\\Socket"
     },
     "scripts": {
         "test": [