main: Update README.md

Signed-off-by: Glavatskikh Denis <denis.glavatskikh@appodeal.com>

Author: da2gl

README.md

@@ -1425,6 +1425,7 @@ Appodeal.setExtraData("attribuition_id", "some value");
 ``` dart
 // Enable or disable tablet banners.
 // SUPORTED ONLY FOR NON-VIEW DISPLAYING
+// THIS METHOD DOES NOT WORK CORRECTLY FOR BANNER VIEW BECAUSE BANNER VIEW DOES NOT SUPPORT TABLET FORMAT
 Appodeal.setTabletBanners(false); //default - false
 
 // Enable or disable smart banners. 
@@ -1688,4 +1689,4 @@ Disable ATT request via Appodeal:
 
 ```dart
 Appodeal.disableAppTrackingTransparencyRequest();
-```
+```