Use Display impl instead of deprecated description method of `Err…

…or` trait (rust-ethereum#286)

* Use Display impl instead of deprecated description method of Error trait

* make Display impl works in no_std env

interpreter/src/error.rs

@@ -1,5 +1,6 @@
 use crate::Opcode;
 use alloc::borrow::Cow;
+use core::fmt;
 
 /// Capture represents the result of execution.
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
@@ -54,23 +55,18 @@ impl From<ExitError> for ExitResult {
 }
 
 #[cfg(feature = "std")]
-impl std::error::Error for ExitError {
-	fn description(&self) -> &str {
+impl std::error::Error for ExitError {}
+
+impl fmt::Display for ExitError {
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 		match self {
-			Self::Exception(_) => "EVM exit exception",
-			Self::Reverted => "EVM internal revert",
-			Self::Fatal(_) => "EVM fatal error",
+			Self::Exception(_) => f.write_str("EVM exit exception"),
+			Self::Reverted => f.write_str("EVM internal revert"),
+			Self::Fatal(_) => f.write_str("EVM fatal error"),
 		}
 	}
 }
 
-#[cfg(feature = "std")]
-impl std::fmt::Display for ExitError {
-	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-		write!(f, "{self:?}")
-	}
-}
-
 /// Exit succeed reason.
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 #[cfg_attr(