upgrade all Cargo.toml files to edition=2021

The MSRV is already 1.60, so this doesn't affect much. The only impact
to other code is that we no longer need to explicitly import TryInto.

2 files changed, 1 insertions, 2 deletions

diff --git a/b3sum/Cargo.toml b/b3sum/Cargo.toml
index a050fb2..1712503 100644
--- a/b3sum/Cargo.toml
+++ b/b3sum/Cargo.toml
@@ -6,7 +6,7 @@ description = "a command line implementation of the BLAKE3 hash function"
 repository = "https://github.com/BLAKE3-team/BLAKE3"
 license = "CC0-1.0 OR Apache-2.0"
 readme = "README.md"
-edition = "2018"
+edition = "2021"
 
 [features]
 neon = ["blake3/neon"]
diff --git a/b3sum/src/main.rs b/b3sum/src/main.rs
index 0af88bb..2b61a67 100644
--- a/b3sum/src/main.rs
+++ b/b3sum/src/main.rs
@@ -1,7 +1,6 @@
 use anyhow::{bail, ensure, Result};
 use clap::Parser;
 use std::cmp;
-use std::convert::TryInto;
 use std::fs::File;
 use std::io;
 use std::io::prelude::*;