Add #[allow(clippy::arc_with_non_send_sync)]

warning: usage of an `Arc` that is not `Send` and `Sync`
  --> src/lib.rs:66:20
   |
66 |             inner: Arc::new(inner),
   |                    ^^^^^^^^^^^^^^^
   |
   = note: `Arc<InnerStarReference>` is not `Send` and `Sync` as `InnerStarReference` is not `Send`
   = help: if the `Arc` will not used be across threads replace it with an `Rc`
   = help: otherwise make `InnerStarReference` `Send` and `Sync` or consider a wrapper type such as `Mutex`
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#arc_with_non_send_sync
   = note: `#[warn(clippy::arc_with_non_send_sync)]` on by default

src/lib.rs

@@ -24,6 +24,7 @@ struct InnerStarReference {
     header_view: HeaderView,
 }
 
+//xxx unsafe impl Send for InnerStarReference {}
 unsafe impl Sync for InnerStarReference {}
 
 impl Drop for InnerStarReference {
@@ -62,6 +63,7 @@ impl StarReference {
             settings,
         };
 
+        #[allow(clippy::arc_with_non_send_sync)]
         Ok(StarReference {
             inner: Arc::new(inner),
         })