Refactor to koa middleware style

[3imed-jaberi]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@3d55f6a). Click here to learn what that means.
The diff coverage is 55.55%.

❗ Current head 098da83 differs from pull request most recent head 247f12e. Consider uploading reports for the commit 247f12e to get more accurate results

@@            Coverage Diff            @@
##             master      #61   +/-   ##
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  Coverage          ?   55.55%           
=========================================
  Files             ?        1           
  Lines             ?       27           
  Branches          ?        0           
=========================================
  Hits              ?       15           
  Misses            ?       12           
  Partials          ?        0           

Impacted Files	Coverage Δ
index.js	55.55% <55.55%> (ø)

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[titanism]

Refactored this a bit further and modernized it. Released koa-csrf v4.0.0, which requires Node >= 14.

https://github.com/koajs/csrf/releases/tag/v4.0.0