typo fix

Author: Yakushima

site/vision/index.html

@@ -136,7 +136,7 @@ <h3>Improving the Haskell Adoption Story</h3>
         A principal goal of the Foundation is to promote adoption of Haskell.   We see that task as having three major components:
       </div>
       <p>
-        <h4>Eliminating unreasonable and perceived barriers to adoption.</h4>
+        <h4>Eliminating unreasonable and perceived barriers to adoption</h4>
 
         Educating the tech community about the benefits of adoption, including decision makers.
         Enhancing the tooling, so that the risk of adoption is dramatically reduced.