Release 1.3.1

[sampajano]

This is the 1.3.1 release of gRPC-Web.

Please see the notes for the previous releases here: https://github.com/grpc/grpc-web/releases. Please consult https://grpc.io/ for all information regarding this product.

This release contains refinements, improvements, and bug fixes, with highlights listed below.

• #1184 Correctly support proto3 optional fields in commonjs+dts .d.ts output @mattnathan
• #1173 Update envoy version to 1.20
• #1172 Fix issue where no RPC is issued when deadline is specified.
• #1167 Fix missing TypeScript return type for serverStreaming calls. @lukasmoellerch
• #1166 Add missing exports from RpcError and add test.
• #1164 Add missing class exports @tinrab
• #1160 Expose MethodDescriptor's public methods @tomferreira

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This discussion was created from the release Release 1.3.1.