update CHANGELOG.md

Author: alvarolb

CHANGELOG.md

@@ -1,3 +1,14 @@
+2.27.0
+
+- Fix compiling issues for AVR
+- Avoid trying to send keep-alive/streams on the first connection timeout
+
+2.26.0
+
+- Add ThingerClient methods to detect socket connection failures to improve network reconnection mechanisms
+- Improve BC66
+- Improve MKRNB1500
+
 2.25.2
 
 - Fix Compiling on WiFi devices without WiFi.begin() support after adding the WebConfig compatibility on ESP32.