update ..

modules/Cargo.toml

@@ -32,6 +32,7 @@ std = [
     "subtle-encoding/std",
     "sha2/std",
     "tendermint/std",
+    "no-std-compat/std",
 ]
 
 [dependencies]

modules/src/ics07_tendermint/header.rs

@@ -1,4 +1,4 @@
-use std::convert::{From, TryFrom, TryInto};
+use std::convert::{TryFrom, TryInto};
 
 use serde_derive::{Deserialize, Serialize};
 use tendermint::block::signed_header::SignedHeader;