[REF] .travis.yml: Using py3.7 stable instead of dev (#635)
[REF] .travis.yml: Using py3.7 stable instead of dev (#635)

Since that https://docs.travis-ci.com/user/languages/python/#specifying-python-versions is updated to use 3.7
acsone/maintainer-quality-tools,OCA/maintainer-quality-tools,acsone/maintainer-quality-tools,OCA/maintainer-quality-tools,OCA/maintainer-quality-tools,acsone/maintainer-quality-tools