refactor(): change name of composer wrapup script

Dockerfile

@@ -40,7 +40,7 @@ COPY config.sql /flarum/app/config.sql
 COPY nginx.conf /etc/nginx/nginx.conf
 COPY php-fpm.conf /etc/php7/php-fpm.conf
 COPY opcache.ini /etc/php7/conf.d/00_opcache.ini
-COPY composer /usr/local/bin/composeur
+COPY extension /usr/local/bin/extension
 COPY s6.d /etc/s6.d
 COPY run.sh /usr/local/bin/run.sh
 

README.md

@@ -134,19 +134,19 @@ docker-compose up -d
 #### Install an extension
 
 ```
-docker exec -ti flarum composeur require some/extension
+docker exec -ti flarum extension require some/extension
 ```
 
 #### Remove an extension
 
 ```
-docker exec -ti flarum composeur remove some/extension
+docker exec -ti flarum extension remove some/extension
 ```
 
 #### List all extensions
 
 ```
-docker exec -ti flarum composeur list
+docker exec -ti flarum extension list
 ```
 
 ### Screenshot