Update index.html

Author: kawaicheung

index.html

@@ -41,6 +41,7 @@ <h3>Naming Things</h3>
     <h1>Naming Things</h1>
     <h2>Thoughts on one of coding&rsquo;s most elusive tasks.<br />By Ka Wai Cheung of <a href="https://www.donedone.com" target="_blank">DoneDone</a>.</h2>
     <h4><a href="#" id="btn-cover-click">Start reading...</a></h4>
+    <h2><a href="https://buymeacoffee.com/kawaicheung">Buy me a coffee.</a></h2>
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