Make the meta charset tag lowercase because reasons.

index.html

@@ -4,7 +4,7 @@
   <meta name="twitter:card" content="summary" />
   <meta name="twitter:description" content="Dumb website for copying symbols." />
   <meta name="twitter:title" content="symbol.wtf" />
-  <meta charset="UTF-8">
+  <meta charset="utf-8">
   <link rel="stylesheet" type="text/css" href="symbols.css" />
   <script src="symbols.js"></script>
 </head>