README updated.

Author: aarkalyk

README.md

@@ -134,7 +134,10 @@ Initialise RNCallKit with options
   - generic
   - number (default)
   - email
+- **hasVideo**: boolean (optional)
+  - false (default)
 - **localizedCallerName**: string (optional)
+- **callback**: (error?: string) => void (optional)
 
 Call when you receive incoming calls to display system UI