[code-quality] PyLint and Travis

Hello there, so I have added PyLint checks to travis. It nicely makes sure that PRs I get submitted become clean. However, for each PyLint release, e.g. 2.0.0, there will be a bunch of findings that are new, and will to be found, leading to the Travis builds to fail due to PyLint, all the time now. How to approach that. Is there a way I could have enforced using 1.9.2 on the "master" branch for Travis (and probably "develop" too), and use the latest greatest PyLint for "factory" only. Anyone know if that is possible, somehow, anybody doing something like that? Or maybe install a given version, but make it an error if that version is not the most recent on only the factory branch, what are people doing in this regard? Yours, Kay