edition: run 'cargo fix --edition --edition-idioms --all'

crates/pcre2/src/lib.rs

@@ -5,9 +5,6 @@ An implementation of `grep-matcher`'s `Matcher` trait for
 
 #![deny(missing_docs)]
 
-extern crate grep_matcher;
-extern crate pcre2;
-
 pub use crate::error::{Error, ErrorKind};
 pub use crate::matcher::{RegexCaptures, RegexMatcher, RegexMatcherBuilder};
 pub use pcre2::{is_jit_available, version};