Update README.md

Author: legendarycode3

README.md

@@ -309,7 +309,7 @@ Run tests with different verbosity levels:
 ## Network Configuration
 ### Sepolia Testnet
 * Entrance Fee:  `0.001 ETH`
-* Interval:
+* Interval:  `30 seconds`
 * VRF Coordinator: `0x9DdfaCa8183c41ad55329BdeeD9F6A8d53168B1B`
 * Gas Lane: `0x787d74caea10b2b357790d5b5247c2f63d1d91572a9846f780606e4d953677ae`
 * Callback Gas Limit: 500,000