Update readme.md

[ainilili]

Support for latest version !

I'm submitting a...

[ ] Bug Fix
[x] Feature
[ ] Other (Refactoring, Added tests, Documentation, ...)

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All committers have signed the CLA.

[su-chang]

Thank for your PR, but why we need add ? here? Could you give me some reason about it?

Thank you very much.

[ainilili]

The code in README.md has a problem in my local environment：

C:\Users\admin\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:434
    return new TSError(diagnosticText, diagnosticCodes)
           ^
TSError: ⨯ Unable to compile TypeScript:
server.ts:51:7 - error TS2769: No overload matches this call.
  The last overload gave the following error.
    Argument of type '"logout"' is not assignable to parameter of type 'never'.

51   .on('logout', (user: Contact, reason: string) => {
         ~~~~~~~~

  node_modules/wechaty/dist/src/wechaty.d.ts:207:5
    207     on(event: never, listener: never): never;
            ~~
    The last overload is declared here.
server.ts:54:4 - error TS2339: Property 'on' does not exist on type 'never'.

54   .on('message', (msg: Message) => {
      ~~

    at createTSError (C:\Users\admin\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:434:12)
    at reportTSError (C:\Users\admin\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:438:19)
    at getOutput (C:\Users\admin\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:578:36)
    at Object.compile (C:\Users\admin\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:775:32)
    at Module.m._compile (C:\Users\admin\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:858:43)
    at Module._extensions..js (internal/modules/cjs/loader.js:787:10)
    at Object.require.extensions.(anonymous function) [as .ts] (C:\Users\admin\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:861:12)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)

• node v10.16.0
• ts-node v8.10.2
• ide vscode

I'm not sure if this error is going to be a problem in any environment, so I mentioned this PR.

[su-chang]

Some compile error about TS.

Maybe you should do some configurations step by step, see more detail: https://github.com/wechaty/wechaty-puppet-padplus/blob/master/readme.md