Merge pull request json-schema-org#18 from tristanpenman/master

Add Valijson to list of implementations

Author: Relequestual

implementations.html

@@ -111,6 +111,7 @@ <h3>C</h3>
 	<h3>C++</h3>
 	<ul>
 		<li><a id="link-impl-libvariant" href="https://bitbucket.org/gallen/libvariant">LibVariant</a> (LGPLv2)</li>
+		<li><a id="link-impl-valijson" href="https://github.com/tristanpenman/valijson">Valijson</a> - header-only library, <em>supports version 4</em> (Simplified BSD)</li>
 	</ul>
 
 	<h3>Haskell</h3>