It should review changed files, not original.

[cnlangzi]

Checklist

• I have searched the Sourcery documentation for the issue, and found nothing
• I have read the common issues and fixes listed in the Sourcery troubleshooting page, and found nothing
• I have checked there are no open bugs referencing the same bug or problem

Description

It should review changed files, not original. please check it on https://github.com/yaitoo/async/pull/3/files

Code snippet that reproduces issue

Debug Information

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[cnlangzi]

it seems also happen on yaitoo/sqle#26 . It asks me to rename migrate with startMigrate. but that is what the PR fixes.