remove duplicated timestamp

Makefile

@@ -123,9 +123,9 @@ publish:
 TOOLSET := `echo "$(sort $(IMAGES_TO_PUBLISH))" | sed -e "s/ /\n - /g"))`
 README_HEAD = `cat ./_README.md | sed -e '/%CONTAINERS_LIST%/Q'`
 README_TAIL = `cat ./_README.md | sed -e '1,/%CONTAINERS_LIST%/d'`
-
+README_FOOTER = `echo "\n\r_Last update: \`date\`_\n"`
 update_readme:
-	@echo "$(README_HEAD)  \n\n - $(TOOLSET)  \n$(README_TAIL)" | sed -e "0,/RE/s/%LAST_UPDATE%/\n_Last update: `date`_ \n/" > README.md
+	@echo "$(README_HEAD)  \n\n - $(TOOLSET) \n $(README_TAIL) \n$(README_FOOTER)" > README.md
 
 delete_dangling_images:
 	@echo "Removing dangling images"

_README.md

@@ -13,5 +13,6 @@ This file is automatically updated after execute `git commit` based on the conte
 
 %CONTAINERS_LIST%
 
-%LAST_UPDATE%
+UNL-ITS-ADS  
+