Add tm

Author: rocky

index.html

@@ -24,7 +24,7 @@
     <header class="inner">
     <a id="forkme_banner" href="https://github.com/mathics/Mathics">View on GitHub</a>
     <h1 id="project_title">Mathics</h1>
-    <h2 id="project_tagline">A free, open-source alternative to Mathematica</h2>
+    <h2 id="project_tagline">A free, open-source alternative to Mathematica&#174</h2>
     </header>
   </div>