Update THIRD_PARTY_LICENSES.txt (#782)

THIRD_PARTY_LICENSES.txt

@@ -34,6 +34,8 @@ Copyright (c) 2018 Akash Kurdekar
 Copyright (c) 2016 Martin Geisler
 ** typed-arena
 Copyright (c) 2018 The typed-arena developers
+** serde-wasm-bindgen
+Copyright (c) 2019 Cloudflare, Inc.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -455,4 +457,4 @@ written authorization of the copyright holder.
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
-   limitations under the License.
+   limitations under the License.