Updated README: new 7.2 and 7.3 images

Author: scara

README.md

@@ -6,6 +6,8 @@ A Moodle PHP environment configured for Moodle development based on [Official PH
 
 | PHP Version  | Variant | Tags             | Status |
 |--------------|---------|------------------|--------|
+| PHP 7.3      | Stretch | 7.3, 7.3-stretch | [![Build Status](https://travis-ci.org/moodlehq/moodle-php-apache.svg?branch=7.3-stretch)](https://travis-ci.org/moodlehq/moodle-php-apache)|
+| PHP 7.2      | Stretch | 7.2, 7.3-stretch | [![Build Status](https://travis-ci.org/moodlehq/moodle-php-apache.svg?branch=7.2-stretch)](https://travis-ci.org/moodlehq/moodle-php-apache)|
 | PHP 7.1      | Stretch | 7.1, 7.1-stretch | [![Build Status](https://travis-ci.org/moodlehq/moodle-php-apache.svg?branch=7.1-stretch)](https://travis-ci.org/moodlehq/moodle-php-apache)|
 | PHP 7.0      | Stretch | 7.0, 7.0-stretch | [![Build Status](https://travis-ci.org/moodlehq/moodle-php-apache.svg?branch=7.0-stretch)](https://travis-ci.org/moodlehq/moodle-php-apache)|
 | PHP 5.6      | Stretch | 5.6, 5.6-stretch | [![Build Status](https://travis-ci.org/moodlehq/moodle-php-apache.svg?branch=5.6-stretch)](https://travis-ci.org/moodlehq/moodle-php-apache)|