docs(): update readme

README.md

@@ -12,7 +12,6 @@
  - **stable** [(Dockerfile)](https://github.com/mondediefr/docker-flarum/blob/master/Dockerfile)
  - **1.0.2** [(Dockerfile)](https://github.com/mondediefr/docker-flarum/blob/1.0.2/Dockerfile)
  - **0.1.0-beta.16** [(Dockerfile)](https://github.com/mondediefr/docker-flarum/blob/0.1.0-beta.16/Dockerfile)
- - **0.1.0-beta.15** [(Dockerfile)](https://github.com/mondediefr/docker-flarum/blob/0.1.0-beta.15/Dockerfile)
 
 ### Features
 

UPGRADE.md

@@ -67,37 +67,3 @@ docker exec -ti flarum php /flarum/app/flarum cache:clear
 ```
 
 After that your upgrade is finish. :tada: :tada:
-
-### Upgrade to v0.1.0-beta.15 from v0.1.0-beta.14.1
-
-:warning: Backup your database, config.php, composer.lock and assets folder  
-:warning: Disable all 3rd party extensions prior to upgrading in panel admin.
-
-1 - Update your docker-compose file, see an example [here](https://github.com/mondediefr/docker-flarum/tree/master#2---docker-composeyml)
-
-```yml
-version: "3"
-
-services:
-  flarum:
-    image: mondedie/flarum:0.1.0-beta.15
-    ...
-```
-
-2 - Pull the last docker images
-
-```sh
-docker pull mondedie/flarum:0.1.0-beta.15
-docker-compose stop flarum
-docker-compose rm flarum
-docker-compose up -d flarum
-```
-
-3 - Updating your database and removing old assets & extensions
-
-```sh
-docker exec -ti flarum php /flarum/app/flarum migrate
-docker exec -ti flarum php /flarum/app/flarum cache:clear
-```
-
-After that your upgrade is finish. :tada: :tada: