Update some dependencies: (#4207)

- derive_more 0.15 -> 0.99
- strum 0.15 -> 0.16
- slog_derive 0.1 -> 0.2

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

substrate/client/transaction-pool/src/error.rs

@@ -25,8 +25,10 @@ pub enum Error {
 	/// Pool error.
 	Pool(txpool::error::Error),
 	/// Error while converting a `BlockId`.
+	#[from(ignore)]
 	BlockIdConversion(String),
 	/// Error while calling the runtime api.
+	#[from(ignore)]
 	RuntimeApi(String),
 }