update readme

README.md

@@ -139,12 +139,14 @@ See [`CONTRIBUTING`](CONTRIBUTING.md) for details.
 - Blockchain explorer with performance report and transaction lookup
 - Transaction generator for loadtesting
 
+### Features To Be Implemented for Mainnet
 
-### Features To Be Implemented
+- Secure VDF
+- Consensus view-change protocol
+- Cross-shard transaction
 
+### Features Planned after Mainnet
+
+- Integration with WASM
 - Fast state synchronization
-- Fully implemented VDF
 - Kademlia routing
-- Consensus view-change protocol
-- Integration with WASM
-- Cross-shard transaction