Remove obsolete requirement maennchen/zipstream-php

Resolves: #2

Author: Mabahe

composer.json

@@ -24,9 +24,7 @@
 		"typo3/cms-core": "^11.0",
 		"typo3/cms-extbase": "*",
 		"typo3/cms-fluid": "*",
-		"typo3/cms-extensionmanager": "*",
-
-		"maennchen/zipstream-php": "^0.4.1"
+		"typo3/cms-extensionmanager": "*"
 	},
 
 	"autoload": {