Added "Powered by libraries.io"

Author: edgardmessias

src/views/menus/main-search.php

@@ -37,7 +37,7 @@
                 'id' => 'query',
                 'required' => true,
                 'autocomplete' => false,
-                'placeholder' => 'package name to search',
+                'placeholder' => 'package name to search, powered by libraries.io',
                 'class' => 'form-control',
                 'autofocus' => true,
                 'tabindex' => 1,

src/views/site/about.php

@@ -103,4 +103,5 @@
 
     <p>This project uses Francois Pluchino's <a href="https://github.com/fxpio/composer-asset-plugin">composer-asset-plugin</a>
         to convert Bower and NPM packages to Composer format.</p>
+    <p>The search is powered by <a href="https://libraries.io/">https://libraries.io/</a>.</p>
 </div>