Added ES6 example to readme

[rukshn]

Updated the readme English by adding ES6 example

[codecov-commenter]

Codecov Report

Merging #49 (0108def) into master (984642f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
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  Coverage   96.60%   96.60%           
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  Files          55       55           
  Lines        1060     1060           
  Branches      279      279           
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  Hits         1024     1024           
  Misses         34       34           
  Partials        2        2           

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[stonehank]

Hi, please keep one example, like this,

const html2md=require('html-to-md')
// or
import html2md from 'html-to-md'

console.log(html2md('<strong><em>strong and italic</em></strong>',options))
// ***strong and italic***

Could you also commit the Chinese version changes which are the same as the English version, thanks

[rukshn]

Yes sure, that's better, I'll make the changes and commit

[stonehank]

Thank you so much