Please add int64 support

[wangjiyang]

This is a great tool for protobuf decoding. Realy like it 👍
Currently I am working on a project which uses some int64 values(As Int64 output). However it seems this tool can't decode it. Is it possible to add this support? Thanks.

[pawitp]

Please provide

1. Sample .proto file
2. Sample input based on the .proto file
3. Expected output

[wangjiyang]

Sorry my fault. It's actually supported.