Run tox tests in TravicCI about serenata-toolbox HOT 3 CLOSED

There is an issues that as far as I understand was introduced on #217 .

I realised it looking at the logs from one of the jobs. Where I saw the message below:

___________________________________ summary ____________________________________
  py38: commands succeeded
SKIPPED:  py37: InterpreterNotFound: python3.7
  py36: commands succeeded
  congratulations :)

Each time that the tox command is executed it try to runs all the 3 Python versions(3.6, 3.7 and 3.8). The impact of it is that it takes a lot of time unnecessarily.

Ideally just one version should be executed for each stage. The job for Python 3.6 doesn't try to run 3.7 our 3.8, for example.

By the way I don't thinking that it block #220 to be merged because it fixes the CI and make the project able to be released.

@willianpaixao @cuducos do you have any ideia how it could be fixed?

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@lipemorais I did noticed that and the PR is not yet finished. I will fix this before merging.

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@lipemorais that issue was fixed.

py38: commands succeeded
SKIPPED:  py37: InterpreterNotFound: python3.7
SKIPPED:  py36: InterpreterNotFound: python3.6

I would like to run tox with '-e $TOXENV` flag but travis fails in passing the environment variable defined in matrix build, leaving only this option, of running all versions and skipping all but one per time. Not the most elegant ever, but in the future if travis fix this glitch we can improve this.

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