fix typo (#124)

Author: JimiHFord

_posts/2021-04-17-traefik-portainer-ssl.md

@@ -32,7 +32,7 @@ chmod 600 acme.json
 touch traefik.yml
 ```
 
-`traefik.config` can be found [here](https://github.com/techno-tim/techno-tim.github.io/tree/master/reference_files/traefik-portainer-ssl/traefik)
+`traefik.yml` can be found [here](https://github.com/techno-tim/techno-tim.github.io/tree/master/reference_files/traefik-portainer-ssl/traefik)
 
 create docker network