reverting to 2018 to fix build checks

Cargo.toml

@@ -13,7 +13,7 @@ categories = [
 ]
 description = "A library to generate and parse UUIDs."
 documentation = "https://docs.rs/uuid"
-edition = "2021"
+edition = "2018"
 exclude = [
     ".github/**"
 ]

src/v7.rs

@@ -6,6 +6,7 @@
 use crate::rng::{bytes, u16};
 use crate::timestamp::Timestamp;
 use crate::{Uuid, Version};
+use core::convert::TryInto;
 
 impl Uuid {
     /// Create a new UUID (version 7) using a time value + random number