Update composer.json

composer.json

 {
-	"name": "HFO4/Cloudreve",
+	"name": "hfo4/cloudreve",
 	"description": "A program help you build your own cloud in minutes.",
 	"keywords": ["php", "cloud", "ThinkPHP", "file-sharing"],
 	"homepage": "https://cloudreve.org",