Update WP CLI to 2.1.0

CHANGELOG

@@ -255,3 +255,6 @@
 * Multisite Metadata
 * Cron API
 
+[2.2.0]
+* Update WP CLI to 2.1.0
+

Dockerfile

@@ -15,7 +15,7 @@ ADD wp-config.php.template /app/code/wp-config.php.template
 
 RUN ln -sf /run/wordpress/wp-config.php /app/code/wp-config.php
 
-RUN curl -L -o /app/code/wp https://github.com/wp-cli/wp-cli/releases/download/v2.0.1/wp-cli-2.0.1.phar
+RUN curl -L -o /app/code/wp https://github.com/wp-cli/wp-cli/releases/download/v2.1.0/wp-cli-2.1.0.phar
 RUN chmod +x /app/code/wp
 RUN /bin/echo -e "apache_modules:\n  - mod_rewrite" > /app/code/wp-cli.yml