Fix rst2html call
Fix rst2html call

Use rst2html4.py, which is provided by docutils,
while rst2hml is actually part of the debian package.

acsone/maintainer-tools,acsone/maintainers-tools,OCA/maintainer-tools,Yajo/maintainer-tools,acsone/maintainer-tools,OCA/maintainer-tools,OCA/maintainer-tools,Yajo/maintainer-tools,acsone/maintainers-tools,acsone/maintainer-tools,acsone/maintainers-tools,Yajo/maintainer-tools,Yajo/maintainer-tools,OCA/maintainer-tools,acsone/maintainer-tools