Add Christian as editor

[christianliebel]

This change (choose at least one, delete ones that don't apply):

• Is a "chore" (metadata, formatting, fixing warnings, etc).

Person merging, please make sure that commits are squashed with one of the following as a commit message prefix:

• chore:
• editorial:
• BREAKING CHANGE:
• And use none if it's a normative change

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