npm install安装的js版本过低，修改一下README

[maihypercube]

/code/checkbox# node -v
v10.19.0

直接使用会报错
/root/code/checkbox/node_modules/yargs/build/index.cjs:1
"use strict";var t=require("assert");class e extends Error{constructor(t){super(t||"yargs error"),this.name="YError",Error.captureStackTrace(this,e)}}let s,i=[];function n(t,o,a,h){s=h;let l={};if(Object.proto>

Error: yargs supports a minimum Node.js version of 12. Read our version support policy: https://github.com/yargs/yargs#supported-nodejs-versions
at Object. (/root/code/checkbox/node_modules/yargs/build/index.cjs:1:59111)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
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)
at Module.require (internal/modules/cjs/loader.js:692:17)
at require (internal/modules/cjs/helpers.js:25:18)
at Object. (/root/code/checkbox/node_modules/yargs/index.cjs:5:30)
at Module._compile (internal/modules/cjs/loader.js:778:30)