Copy description from Cargo.toml to METADATA am: 1b5d2e302f am: 626953b181 am: fd3827cc4e

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/async-trait/+/1456776

Change-Id: Icd1f7e153d07ad5f499e696ac34ac48f574721eb
diff --git a/METADATA b/METADATA
index 059a608..a0eb879 100644
--- a/METADATA
+++ b/METADATA
@@ -1,5 +1,5 @@
 name: "async-trait"
-description: "Async trait methods."
+description: "Type erasure for async trait methods"
 third_party {
   url {
     type: HOMEPAGE