Add php 7.1 to README

Author: zaporylie

README.md

@@ -17,6 +17,9 @@ Version | Type | Tags | Dockerfile
 7.0 | cli | `7.0-cli`, `7-cli` | [Dockerfile](https://github.com/drupal-docker/php/blob/master/7.0/Dockerfile)
 7.0 | apache | `7.0-apache`, `7-apache` | [Dockerfile](https://github.com/drupal-docker/php/blob/master/7.0/apache/Dockerfile)
 7.0 | fpm | `7.0-fpm`, `7.fpm`, `7.0`, `7` | [Dockerfile](https://github.com/drupal-docker/php/blob/master/7.0/fpm/Dockerfile)
+7.1 | cli | `7.1-cli` | [Dockerfile](https://github.com/drupal-docker/php/blob/master/7.1/Dockerfile)
+7.1 | apache | `7.1-apache` | [Dockerfile](https://github.com/drupal-docker/php/blob/master/7.1/apache/Dockerfile)
+7.1 | fpm | `7.1-fpm`, `7.1` | [Dockerfile](https://github.com/drupal-docker/php/blob/master/7.1/fpm/Dockerfile)
 
 # Quickstart: