Update README.md

Author: github-actions[bot]

README.md

@@ -60,7 +60,7 @@ services:
     container_name: secured-signal
     environment:
       API__URL: http://signal-api:8080
-      SETTINGS__VARIABLES__RECIPIENTS: ["123400002", "123400003", "123400004"]
+      SETTINGS__VARIABLES__RECIPIENTS: ["+123400002", "+123400003", "+123400004"]
       SETTINGS__VARIABLES__NUMBER: "+123400001"
       API__TOKENS: [LOOOOOONG_STRING]
     labels: