Use stream instead of zip file

src/main/kotlin/starter/ProjectZip.kt

@@ -3,22 +3,19 @@ package starter
 import starter.templates.Template
 import starter.utils.ZipOutput
 import starter.utils.sanitizeFilename
+import java.io.ByteArrayOutputStream
 
 class ProjectZip(private val templates: List<Template>) {
 
-    fun createZip(project: Project): String {
-        val name: String
-
+    fun createZip(project: Project): ByteArrayOutputStream {
         val projectName = sanitizeFilename(project.name)
-        ZipOutput(projectName).use { zip ->
-            name = zip.name
-
+        val zipOutput = ZipOutput()
+        zipOutput.use { zip ->
             templates.filter { it.enabled(project) }.forEach { template ->
                 zip.write(projectName + "/" + template.path(project), template.render(project))
             }
         }
-
-        return name
+        return zipOutput.outputStream
     }
 
 }