Update README.md

Updating the README.md for the latest release 1.31.0

Author: Wylbur

README.md

@@ -8,8 +8,8 @@
 # Supported tags and Dockerfile links
 
 
-- [`1.30.2-apache`, `1.30.2`, `1-apache`, `1` (*1/apache/Dockerfile*)](https://github.com/kalabox/backdrop-docker/blob/master/1/apache/Dockerfile)
-- [`1.30.2-fpm`, `1-fpm` (*1/fpm/Dockerfile*)](https://github.com/kalabox/backdrop-docker/blob/master/1/fpm/Dockerfile)
+- [`1.31.0-apache`, `1.31.0`, `1-apache`, `1` (*1/apache/Dockerfile*)](https://github.com/kalabox/backdrop-docker/blob/master/1/apache/Dockerfile)
+- [`1.31.0-fpm`, `1-fpm` (*1/fpm/Dockerfile*)](https://github.com/kalabox/backdrop-docker/blob/master/1/fpm/Dockerfile)
 
 
 # Launch Backdrop using Docker
@@ -269,4 +269,4 @@ View [license information](https://www.drupal.org/licensing/faq) for the softwar
 - [Backdrop CMS Documentation](https://docs.backdropcms.org/)
 
 ## Contributing
-- [Contribute to the Backdrop CMS Open Source Project](https://docs.backdropcms.org/documentation/contributors-guide)
+- [Contribute to the Backdrop CMS Open Source Project](https://docs.backdropcms.org/documentation/contributors-guide)