use recommended spdx license identifier

Signed-off-by: Christoph Hartmann <chris@lollyrock.com>

Author: chris-rock

inspec.yml

@@ -6,7 +6,7 @@ version: 0.3.0
 maintainer: Christoph Hartmann
 copyright: Christoph Hartmann
 copyright_email: chris@lollyrock.com
-license: MPLv2
+license: MPL-2.0
 
 supports:
   - os-family: linux