updated CHANGELOG and __pkginfo__.py file

CHANGELOG

+version 0.7.0
+-------------
+* CHANGED   propagate the headless state to all children
+* CHANGED   better code for checking missing jinja 2 templates
+
 version 0.6.0
 -------------
 * CHANGED   existing templates are now skipped from packer run

src/packme/__pkginfo__.py

@@ -20,7 +20,7 @@ __status__ : str = "Prototype"
 
 __url__ : str = "https://code.ill.fr/panosc/data-analysis-services/packme"
 
-__version__ : str = "0.6.0"
+__version__ : str = "0.7.0"
 
 __long_description_content_type__ : str ="text/markdown"