fix error listing the available tools

Makefile

@@ -130,7 +130,6 @@ 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 $(TOOLSET)
 	@echo "$(README_HEAD)  \n\n$(TOOLSET) \n $(README_TAIL) \n$(README_FOOTER)" > README.md
 	@git add README.md
 

README.md

@@ -30,4 +30,4 @@ This file is automatically updated after execute `git commit` based on the conte
 - its-registry.unl.edu/unl-its/docker-ci/static-code-analysis:python 
     
 
-_Last update: Fri May 31 17:38:15 CDT 2019_
+_Last update: Fri May 31 17:38:34 CDT 2019_