Add bad code smell for open without encoding=

[FredHappyface]

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Python on Windows defaults to an encoding that differs to the standard utf-8 on other platforms (pretty sure it's code page 1525 or something like that). This often means that my code contains bugs that are only triggered under Windows. Having looked into this, it seems to be a pretty common issue and it looks like PSF are reluctant to set the default to uft-8 on all platforms...

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I would very much appreciate it if pylint was willing to add a bad code smell or similar level finding for functions such as open, Popen lacking a user defined encoding

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Thanks for this fantastic project

[FredHappyface]

My bad looks like I missed

#3826

[hippo91]

@FredHappyface no pb! 😄