release stable 1.3.4.1

package.xml

@@ -40,8 +40,8 @@
   <api>1.3.4.1</api>
  </version>
  <stability>
-  <release>beta</release>
-  <api>beta</api>
+  <release>stable</release>
+  <api>stable</api>
  </stability>
  <license uri="https://github.com/viest/php-ext-excel-export/blob/master/LICENSE">BSD license</license>
  <notes>