'Schematron/schematron' project will be archived and read-only from 1 October 2020

[tgraham-antenna]

This project, 'Schematron/schematron', has not had any code updates for two years. It receives occasional pull requests and new issues, but nothing is being done about them.

With the continuing absence of anyone with the time and energy to maintain the project, this project will be made read-only on or after 1 October 2020. New applications of Schematron are recommended to use the SchXslt implementation at https://github.com/schxslt/schxslt that is actively maintained by @dmj.

Should a new maintainer or new maintainers step forward, then either the project would not need to be archived or it could be taken out of archive, but at this point, the most accurate status for the project is for it to be read-only.