change an xml file to trigger doc build

Author: emylonas

guidelines/xml/app-allidx.xml

@@ -1,5 +1,5 @@
 <!-- Start license statement: do not remove 
-    
+     
     EpiDoc: Guidelines for Structured Markup of Epigraphic Texts in TEI
     Edition 8 copyright © 2008–2016 by all contributors listed in <div type="gl-responsibility">, below.
     Additional contributors' copyright may be designated in individual source files.