Docs(README.md#L151): Documentation inaccuracies

[sunrabbit123]

microsoft/TypeScript#14419 (comment)

Hello @sunrabbit123

Your documentation shows an incomplete type declaration for the plugins:

(program: ts.Program, config?: PluginConfig) => ts.TransformerFactory;

In fact there is a third argument which is important.

(program: ts.Program, config: PluginConfig, helpers: { ts: typeof ts; addDiagnostic: (diag: ts.Diagnostic) => void }) => ts.TransformerFactory;

Passing references to ts makes the plugin completely dependency-free.
Passing callback addDiagnostic allows it to interact with the user in accordance with the compiler standard (instead of console.log).

I think it's important that authors of their own compilers and plugins maintain this standard.