Merge pull request stackgl#4 from olivierrr/master

Fix invalid link.

Author: hughsk

index.html

@@ -66,7 +66,7 @@ <h3>WebGL Workshop</h3>
       <p>
         Some other good learning resources include
         <a target="_blank" href="http://learningwebgl.com">Learning WebGL</a>,
-        <a target="_blank" href="http://http://www.webglacademy.com/">WebGL Academy</a>, and
+        <a target="_blank" href="http://www.webglacademy.com/">WebGL Academy</a>, and
         <a target="_blank" href="http://glslsandbox.com/">GLSL Sandbox</a>.
 
         If you're particularly interested in shaders, you might want to out