Update edition to 2021

[Dirreke]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.46%. Comparing base (c7ff9dc) to head (206864c).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #408 +/- ##
==========================================
+ Coverage 86.92% 87.46% +0.53% 
==========================================
Files 64 65 +1 Lines 3649 3893 +244 ==========================================
+ Hits 3172 3405 +233 - Misses 477 488 +11 

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