Invalid entries in plugin.json

[cschol]

[VCV] Validating plugin.json...
Exception validating URL: kring.co.uk ([Errno -2] Name or service not known)
FAILED                                    
[VCV] Issues found in `plugin.json`:                

Invalid URL: kring.co.uk   
Invalid license ID: proprietary                    
-- License must be a valid Identifier from https://spdx.org/licenses/

For the Invalid URL issue, please add "https://" to the URL. For the Invalid license issue, please select the appropriate license identifier from the SPDX database at the URL above.

[jackokring]

Changes commited.