Add Merge to prototext.UnmarshalOptions #53
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This adds a Merge option to prototext.UnmarshalOptions to match proto.UnmarshalOptions. This is particularly useful when needing to read multiple textproto files of the same format that wrap a single repeated field.
I've added this to the exact same position in the UnmarshalOptions struct as the proto version. It can be moved to the bottom of the struct definition if that would cause backwards compatibility issues, but I wasn't aware of any.