Explain what a variant means in other languages (#157)

Author: mratsim

jekyll/index.html

@@ -39,7 +39,7 @@ <h3>Elegant</h3>
         <ul>
           <li>Macros cannot change Nim's syntax because there is no need for it —
               the syntax is flexible enough.</li>
-          <li>Modern type system with local type inference, tuples, variants, generics, etc.</li>
+          <li>Modern type system with local type inference, tuples, generics and sum types.</li>
           <li>Statements are grouped by indentation but can span multiple lines.</li>
         </ul>