Generate longer captchas

[wirespecter]

Every captcha that is generated is 5 characters long.

If I want to generate an 8-length captcha using the code below:
const { token, buffer } = captcha(8)

A 5-length captcha is generated instead.

[fundon]

Ok, I like this feature.

[fundon]

@vipersec See https://github.com/trekjs/captcha/tree/pure-js.

I had refactored it to pure JS. We can do more.

[mtsee]

SyntaxError: Unexpected token function
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:387:25)
at babelWatchLoader (D:\DT\H5DS3.0\build\node_modules.2.0.7@babel-watch\run
ner.js:50:13)
at Object.require.extensions.(anonymous function) [as .js] (D:\DT\H5DS3.0\bu
ild\node_modules.2.0.7@babel-watch\runner.js:61:7)
at Module.load (module.js:357:32)
at Function.Module._load (module.js:314:12)
at Module.require (module.js:367:17)
at require (internal/module.js:16:19)
at Object. (D:\DT\H5DS3.0\build\router.js:13:19)
at Module._compile (module.js:413:34)

[fundon]

@mtsee Which Node.js version you are using?

[mtsee]

v6.2.0

[fundon]

async/await requires v8+.