Migrate to Rust 2021.

- Remove TryFrom and TryInto, which are in the prelude in Rust 2021.

Author: kamadak

Cargo.toml

@@ -2,7 +2,7 @@
 name = "exif"
 version = "0.5.5"
 authors = ["KAMADA Ken'ichi <[email protected]>"]
-edition = "2018"
+edition = "2021"
 rust-version = "1.60"
 
 description = "Exif parsing library written in pure Rust"

src/isobmff.rs

@@ -24,7 +24,6 @@
 // SUCH DAMAGE.
 //
 
-use std::convert::{TryFrom as _, TryInto as _};
 use std::io::{BufRead, ErrorKind, Seek, SeekFrom};
 
 use crate::endian::{Endian, BigEndian};