Update README.md

MichalKrasowski · web-flow · commit de7d8e8a4c30 · 2021-12-17T22:00:17.000+01:00
diff --git a/README.md b/README.md
@@ -10,6 +10,7 @@ The integration of heating controllers from Polish company TECH Sterowniki Sp. z
 eModul API Documentation  https://emodul.eu/docs/api-v1.txt
 
 The integration is based on API provided by TECH which supports following controllers:
+* L-4 Wifi
 * L-7
 * L-8
 * WiFi 8S
