Add support for proto3 optional fields #25
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protoc v3.12.0 added support for the
optionalannotation to proto3 (see RC: https://github.com/protocolbuffers/protobuf/releases/tag/v3.12.0-rc1).In order to support this,
protoc-gen-starwas updated to0.5.3, and for running tests thegrpc-toolsgem was updated to1.37.1.Also adds
clear_<field_name>methods for all fields andhas_<field_name>?methods for optional fields.Fixes #24.