update manifest

Author: bkelly16

manifest.json

@@ -4,7 +4,7 @@
     "title": "Py-libzfs",
     "description": "python libzfs",
     "version": "2.1.1",
-    "buildVersion": "2",
+    "build_number": "2",
     "stable": true,
     "author": "Brett Kelly <bkelly@45drives.com>",
     "git_url": "https://github.com/45Drives/python3-libzfs",