Copy description from Cargo.toml to METADATA

Test: make
Change-Id: Id5892124ed5d5c28fea7e81e06dd885bb52fb8a0
diff --git a/METADATA b/METADATA
index 879f0ef..8e3e8e8 100644
--- a/METADATA
+++ b/METADATA
@@ -1,5 +1,5 @@
 name: "quote"
-description: "This crate provides the quote! macro for turning Rust syntax tree data structures into tokens of source code."
+description: "Quasi-quoting macro quote!(...)"
 third_party {
   url {
     type: HOMEPAGE