Added refresh to external component config.

CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 - Fixed a compilation issue with ESPHome 2021.9.0. 
+- Added `refresh: 60s` to the `external_components` definition in `example.yaml`,
+  to make use that the code is updated when using a non-release ref (e.g. `main`
+  instead of `2021.9.0`).
 
 ## [2021.8.1]
 

example.yaml

@@ -115,6 +115,7 @@ external_components:
       type: git
       url: https://github.com/mmakaay/esphome-xiaomi_bslamp2
       ref: main
+      refresh: 60s
 
 # A special platform package is used for enabling unicore and disabling the
 # efuse mac crc check. These two changes are required for the ESP32-WROOM-32D