Fix typo in util.py

[eltociear]

Description

identifer -> identifier

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

[cla-bot]

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[eltociear]

I signed CLA.

[leahwicz]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[jtcohen6]

@eltociear Thanks for the PR! We wouldn't normally require a changelog entry for changes to non-functional code, but we also want to give you credit for the contribution :) think you could create a changelog entry and push it up?

[eltociear]

@jtcohen6
Thank you for contacting!
I created a change log entry using changie.

[emmyoop]

Update the changelog and this should be good to go! Thanks for the contribution.