add path to twine for upload command

Author: Fabien Coelho

Makefile

@@ -102,7 +102,7 @@ dist: venv
 .PHONY: publish
 publish: dist
 	# provide pypi login/pw or token somewhere…
-	echo twine upload dist/*
+	echo venv/bin/twine upload dist/*
 
 # generate pdf doc
 MD2PDF  = pandoc -f markdown -t latex -V papersize:a4 -V geometry:hmargin=2.5cm -V geometry:vmargin=3cm