deprecate in favor to ts 3.7 a?.b?.c

[akoidan]

Add note that you can use integrated into ts optional chain feature since 3.7

[pauloavelar]

As much as it saddens me, it's the right way to go. I mean, there are many projects which will take a good while to upgrade to 3.7 for a plethora of reasons, but those who can use it, it's the right way to go and we have a duty to let them know.

[swyxio]

RIP this project. but fantastic kudos for doing something really cool with TS plugins.

[FFdhorkin]

I'm not sure this is fully deprecated, yet. TypeScript itself supports optional chaining now, but if you are using ts-loader and want to use latest features in es2020, like BigInt... node doesn't support optional chaining yet, and so it breaks: TypeStrong/ts-loader#1061