Doesn't respect optional fields when using proto2 syntax

[mpetrunic]

Example: libp2p/js-libp2p-daemon#94

[mpetrunic]

I don't think this is fixable unless there is a way to distinguish proto2 vs proto3 sytax here: https://github.com/ipfs/protons/blob/master/packages/protons/src/index.ts#L121
cc @achingbrain

[BigLep]

2022-06-07 conversation: we're going to throw an error if we see proto2 syntax.

[MarcoPolo]

2022-06-07 conversation: we're going to throw an error if we see proto2 syntax.

I don't think this is a viable solution. Right now, we have a lot of proto2 definitions.

[github-actions]

🎉 This issue has been resolved in version protons-v6.1.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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