added changelog

CHANGELOG.md

@@ -1,3 +1,11 @@
+# 2020-11-23
+
+## Breaking change matrix-sms-bridge
+
+Because of many problems using gammu as SMS provider, matrix-sms-bridge now uses (https://github.com/RebekkaMa/android-sms-gateway-server) by default. See (the docs)[./docs/configuring-playbook-bridge-matrix-bridge-sms.md] which new vars you need to add.
+
+If you are using this playbook to deploy matrix-sms-bridge and still really want to use gammu as SMS provider, we could possibly add support for both android-sms-gateway-server and gammu.
+
 # 2020-11-13
 
 ## Breaking change matrix-sms-bridge