Merge pull request #1544 from oasisprotocol/kostko/feature/freshness-…

…proofs

runtime-sdk: Enable freshness proofs

runtime-sdk/src/runtime.rs

@@ -200,6 +200,7 @@ pub trait Runtime {
                 trust_root: Self::consensus_trust_root(),
                 features: Some(features),
                 persist_check_tx_state: false,
+                freshness_proofs: true,
                 ..Default::default()
             },
         );