src/main.rs: remove clippy::unnested_or_patterns
#![allow(clippy::non_ascii_literal)]
#![allow(clippy::option_if_let_else)]
#![allow(clippy::too_many_lines)]
-#![allow(clippy::unnested_or_patterns)] // TODO: remove this when we support Rust 1.53.0
#![allow(clippy::unused_self)]
#![allow(clippy::upper_case_acronyms)]
#![allow(clippy::wildcard_imports)]
