Fix "Prefer format() over string interpolation operator" issue

[jason-neal]

This pull request automatically fixes all occurrences of the following issue:

Issue type: Prefer format() over string interpolation operator
Issue details: https://www.quantifiedcode.com/app/project/gh:jason-neal:spectrum_overload?groups=code_patterns/%3A4ACGxFj1

To adjust the commit message or the actual code changes, just rebase or cherry-pick the commits.
For questions or feedback reach out to cody@quantifiedcode.com.

Legal note: We won't claim any copyrights on the code changes.

Cheers,
Cody - Your code quality bot

[coveralls]

Coverage remained the same at 71.782% when pulling 37a0417 on autofix/wrapped2_to3_fix into f812550 on master.