Fix warnings in new rust versions

Author: tailhook

src/parser.rs

@@ -8,10 +8,12 @@ use std::iter::Peekable;
 use std::slice::Iter;
 use std::hash::Hash;
 use std::hash::Hasher;
-use std::ascii::AsciiExt;
 use std::str::FromStr;
 use std::process::exit;
 
+#[allow(unused_imports)] #[allow(deprecated)]
+use std::ascii::AsciiExt;
+
 use std::collections::HashMap;
 use std::collections::hash_map::Entry;
 use std::collections::HashSet;