Fixed link to new release

Author: basvodde

_includes/header.html

@@ -42,8 +42,8 @@ <h2>CppUTest unit testing and mocking framework for C/C++</h2>
         </nav>
 
         <section id="downloads">
-          <a href="https://github.com/cpputest/cpputest.github.io/blob/master/releases/cpputest-3.8.zip?raw=true" class="btn btn-inverse">Download Release 3.8 as .zip</a>
-          <a href="https://github.com/cpputest/cpputest.github.io/blob/master/releases/cpputest-3.8.tar.gz?raw=true" class="btn btn-inverse">Download Release 3.8 as .tar.gz</a>
+          <a href="https://github.com/cpputest/cpputest/releases/download/v3.8/cpputest-3.8.zip" class="btn btn-inverse">Download Release 3.8 as .zip</a>
+          <a href="https://github.com/cpputest/cpputest/releases/download/v3.8/cpputest-3.8.tar.gz" class="btn btn-inverse">Download Release 3.8 as .tar.gz</a>
         </section>
 	  </div>
     </header>