Feature Request: Add a file filter

[HuakunShen]

Is your feature request related to a problem? Please describe. Some files pushed to git don't necessarily reflect contributions. For example, package-lock.json.

Describe the solution you'd like Add a filter to filter out contributions from specific files.

[igbanam]

This already exists.

export _GIT_PATHSPEC=':!pattern'

To see this, checkout man git-quick-stats and scroll to the bottom

https://github.com/arzzen/git-quick-stats/blob/d33ede9bcc525e2ab35972bf2c1ed6cee457a603/git-quick-stats.1#L146-L149