Add advisory for data race in lever

crates/lever/RUSTSEC-0000-0000.md

@@ -0,0 +1,21 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "lever"
+date = "2020-11-10"
+url = "https://github.com/vertexclique/lever/issues/15"
+categories = ["memory-corruption"]
+keywords = ["concurrency"]
+
+[versions]
+patched = []
+```
+
+# AtomicBox<T> lacks bound on its Send and Sync traits allowing data races
+
+`AtomicBox<T>` is a `Box` type designed to be used across threads, however, it
+implements the `Send` and `Sync` traits for all types `T`.
+
+This allows non-Send types such as `Rc` and non-Sync types such as `Cell` to
+be used across thread boundaries which can trigger undefined behavior and
+memory corruption.