docs(release): version 2.6.0 changelog

Author: David-Lor

README.md

@@ -33,6 +33,12 @@ _Bot de Telegram que permite consultar las paradas y autobuses que se dirigen a
 
 ## Changelog
 
+- 2.6.0
+  - update deprecated Stop messages with a warning
+  - include calculated arrival time (HH:MM) on buses
+  - avoid logging warnings on 404 HTTP responses
+  - allow loading settings from an arbitrary env file specified by the ENV_FILE env var
+  - upgrade requirements versions
 - 2.5.1
     - fix error handling for HTTP timeouts
     - return the request id on error messages (only normal messages, not inline replies)