Fix unused warnings

src/actions/notifications.rs

@@ -15,7 +15,6 @@ use crate::Span;
 use log::{debug, trace, warn};
 use rls_vfs::{Change, VfsSpan};
 use serde::Deserialize;
-use serde_json;
 use std::sync::atomic::Ordering;
 
 use crate::build::*;

src/build/rustc.rs

@@ -301,7 +301,6 @@ impl<'a> CompilerCalls<'a> for RlsRustcCalls {
                 edition: match state.session.edition() {
                     RustcEdition::Edition2015 => Edition::Edition2015,
                     RustcEdition::Edition2018 => Edition::Edition2018,
-                    _ => Edition::default(),
                 },
             };
             let files = fetch_input_files(state.session);