Removing variable being reassigned

[zak-hassan]

First off thank you for providing great open source pytest. Wanted to make a small bug fix. I see your reassigning a variable explanation = explanation then using it below that. Didn't make logically sense. So I thought would be nice to send a bug fix.

• Target the master branch for bug fixes, documentation updates and trivial changes.
• Target the features branch for new features, improvements, and removals/deprecations.
• Include documentation when adding new features.
• Include new tests or update existing tests when applicable.

Unless your change is trivial or a small documentation fix (e.g., a typo or reword of a small section) please:

• Create a new changelog file in the changelog folder, with a name like <ISSUE NUMBER>.<TYPE>.rst. See changelog/README.rst for details.
• Add yourself to AUTHORS in alphabetical order;

[zak-hassan]

Why did that codecov fail. Must be cause I removed a line of code??

[The-Compiler]

Thanks! cc @asottile who introduced this (probably by accident) in be2be04.

Codecov fails because the project coverage slightly dropped as a previously covered line is now gone - this isn't a problem, though.

[asottile]

hmm yeah automated tooling sometimes exposes the nonsense that was already there 😆 (this used to be explanation = ecu(explanation)