Added missing meta-data (fixes console error in FF)

Author: wdamien

index.html

@@ -13,6 +13,8 @@
 	<link rel="shortcut icon" href="/favicon.ico" type="image/vnd.microsoft.icon" />
 	<link rel="shortcut icon" href="/assets/favicon.png" type="image/png" />
 
+    <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
+
 	<meta name=viewport content="width=device-width, initial-scale=1, user-scalable=yes">
 
 	<meta name="description" content="Regular expression tester with syntax highlighting, contextual help, video tutorial, reference, and searchable community patterns." />