Set badge to SVG

README.md

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 # Zabbix for YunoHost
 
 [![Integration level](https://dash.yunohost.org/integration/zabbix.svg)](https://dash.yunohost.org/appci/app/zabbix) ![](https://ci-apps.yunohost.org/ci/badges/zabbix.status.svg) ![](https://ci-apps.yunohost.org/ci/badges/zabbix.maintain.svg)  
-[![Install zabbix with YunoHost](https://install-app.yunohost.org/install-with-yunohost.png)](https://install-app.yunohost.org/?app=zabbix)
+[![Install zabbix with YunoHost](https://install-app.yunohost.org/install-with-yunohost.svg)](https://install-app.yunohost.org/?app=zabbix)
 
 > *This package allow you to install Zabbix quickly and simply on a YunoHost server.  
 If you don't have YunoHost, please see [here](https://yunohost.org/#/install) to know how to install and enjoy it.*