Add Matrix environment variables to README

CHANGELOG.md

@@ -7,6 +7,7 @@ All notable changes to this project will be documented in this file.
 - Add the "desc" field (check's description) to API responses
 - Add maxlength attribute to HTML input=text elements
 - Improved logic for displaying job execution times in log (#219)
+- Add Matrix integration
 
 ### Bug Fixes
 - Fix refreshing of the checks page filtered by tags (#221)

README.md

@@ -128,6 +128,9 @@ Configurations settings loaded from environment variables:
 | TWILIO_FROM | `None`
 | PD_VENDOR_KEY | `None`
 | TRELLO_APP_KEY | `None`
+| MATRIX_HOMESERVER | `None`
+| MATRIX_USER_ID | `None`
+| MATRIX_ACCESS_TOKEN | `None`
 
 
 Some useful settings keys to override are: