Update src/Composer/Downloader/ArchiveDownloader.php

Fix to single-file archive

src/Composer/Downloader/ArchiveDownloader.php

@@ -47,6 +47,12 @@ abstract class ArchiveDownloader extends FileDownloader
             if (1 === count($contentDir)) {
                 $contentDir = $contentDir[0];
 
+                if(is_file($contentDir)){
+                    rename($contentDir, $path . '/' . basename($fileName));
+                    unlink($contentDir);
+                }
+                else{
+                    
                     // Rename the content directory to avoid error when moving up
                     // a child folder with the same name
                     $temporaryName = md5(time().rand());
@@ -59,10 +65,7 @@ abstract class ArchiveDownloader extends FileDownloader
                         }
                     }
                 
-                if(is_file($contentDir)){
-                    unlink($contentDir);
-                }
-                else{
+
                     rmdir($contentDir);
                 }
             }