Add *.bak for gitignore

Description

While running `python-modernize`, its generate .bak file.
So, I guess we need to ignore `*.bak` in git

@edx/ecommerce

Done

Assignee

Unassigned

Reporter

Open Source Pull Request Bot

Labels

URL

Contributor Name

Amit Vadhel

Repo

edx/ecommerce

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Learner Experiences - Credentials

Platform Map Area (Levels 3 & 4)

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edX Theme

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edX Squad

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Github Lines Added

4

Github Lines Deleted

1

Priority

Unset