Merge pull request #168 from lkwg82/fix-tabs-spaces-of-example-docker-compose

fix code example (tabs in yaml)

README.md

@@ -53,7 +53,7 @@ Notes:
 
 Sample `docker-compose.yml`file:
 
-```sh
+```yaml
 version: "3"
 services:
   signal-cli-rest-api:
@@ -65,7 +65,6 @@ services:
       - "8080:8080" #map docker port 8080 to host port 8080.
     volumes:
       - "./signal-cli-config:/home/.local/share/signal-cli" #map "signal-cli-config" folder on host system into docker container. the folder contains the password and cryptographic keys when a new number is registered
-
 ```
 
 ## Documentation