Copy description from Cargo.toml to METADATA am: 04265b7097

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/bitflags/+/1456147

Change-Id: I634c66a5de84a37cae6bbb877dc6ededc08ad2dc
diff --git a/METADATA b/METADATA
index fadefbd..2f3c213 100644
--- a/METADATA
+++ b/METADATA
@@ -1,5 +1,5 @@
 name: "bitflags"
-description: "A Rust macro to generate structures which behave like a set of bitflags."
+description: "A macro to generate structures which behave like bitflags."
 third_party {
   url {
     type: HOMEPAGE