help: update copyright

raveit65 · raveit65 · commit 25ffe55c06a5 · 2019-03-10T09:46:39.000+01:00
diff --git a/mate-user-guide/C/index.docbook b/mate-user-guide/C/index.docbook
@@ -12,7 +12,7 @@
       and preferences.</para>
     </abstract>
     <copyright>
-      <year>2015</year>
+      <year>2019</year>
       <holder>MATE Documentation Project</holder>
     </copyright>
     <copyright>
@@ -277,4 +277,4 @@
   <xi:include href="glossary.xml"/>       <!-- Glossary -->
   <xi:include href="gosfeedback.xml"/>    <!-- Feedback -->
 
-</book>
+</book>
