Show not implemented message instead of raising NotImplementedError, warn if PythonLinter.check is not overridden.
Show not implemented message instead of raising NotImplementedError, warn if PythonLinter.check is not overridden.

Raynos/SublimeLinter3-raynos,paulirish/SublimeLinter3,zenlambda/SublimeLinter3,SublimeLinter/SublimeLinter3,ikappas/SublimeLinter3,SublimeLinter/SublimeLinter3,paulirish/SublimeLinter3,jasonrhaas/SublimeLinter3,simonzack/SublimeLinter3,ikappas/SublimeLinter3,smanolloff/SublimeLinter3,simonzack/SublimeLinter3,smanolloff/SublimeLinter3,jasonrhaas/SublimeLinter3,zenlambda/SublimeLinter3