Fix warning in Travis
Created by: danghai
I make PR to resolve warning in travis.
flake8 runtests: commands[0] | flake8 --show-source .
WARNING: test command found but not installed in testenv
Created by: danghai
I make PR to resolve warning in travis.
flake8 runtests: commands[0] | flake8 --show-source .
WARNING: test command found but not installed in testenv