Update README.md

Tautvilas Mečinskas · web-flow · commit 6fc98917bc08 · 2017-08-03T09:44:01.000+03:00
diff --git a/README.md b/README.md
@@ -139,6 +139,8 @@ LocaleConfig.defaultLocale = 'fr';
 />
 ```
 
+Keep in mind that different marking types are not compatible. You can use just one marking style for calendar.
+
 #### Displaying data loading indicator
 
 <kbd>
