[www] Update the link to the 'include what you use' project

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@286121 91177308-0d34-0410-b5e6-96231b3b80d8

www/related.html

@@ -64,7 +64,7 @@
       <dd>
         <p>
           <b>Site:</b>
-        <a href="http://code.google.com/p/include-what-you-use/">http://code.google.com/p/include-what-you-use/</a>
+        <a href="https://github.com/include-what-you-use/include-what-you-use">https://github.com/include-what-you-use/include-what-you-use</a>
         </p>
         <p>
         Analyze #includes in C and C++ source files