Merge pull request #2 from danielhenrymantilla/patch-1

Remove the `T : Send` bound for `SyncWrapper` to be `Sync`

Author: rkuhn

src/lib.rs

@@ -123,4 +123,4 @@ impl<T> SyncWrapper<T> {
 
 // this is safe because the only operations permitted on this data structure require exclusive
 // access or ownership
-unsafe impl<T: Send> Sync for SyncWrapper<T> {}
+unsafe impl<T> Sync for SyncWrapper<T> {}