Update readme with reference to tailwind plugin

[manishrc]

Add reference to Tailwindcss plugin for Typography.js

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Hi Kyle,

I used typography.js in a few projects and loved the idea of calculating the styles. When working with Tailwind, I saw issue where their base styles overrode the typography.js styles.

This is a plug-in for tailwind-css that allows using typography.js.

This was also accepted on https://www.tailwindtoolbox.com/plugins

Thank you

[codecov-io]

Codecov Report

Merging #255 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #255   +/-   ##
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  Coverage   98.26%   98.26%           
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  Files          43       43           
  Lines         230      230           
  Branches       17       17           
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  Hits          226      226           
  Misses          4        4           

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