Update criterion

[moCello]

• Update criterion dev-dependency to latest version
• Update outdated toolchain
• Remove accidentally pushed notes file
• Fix code formatting

[codecov]

Codecov Report

Merging #772 (96dc8f8) into master (1a56273) will increase coverage by 0.07%.
The diff coverage is n/a.

❗ Current head 96dc8f8 differs from pull request most recent head 73f3d19. Consider uploading reports for the commit 73f3d19 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #772      +/-   ##
==========================================
+ Coverage   84.87%   84.95%   +0.07%     
==========================================
  Files          57       57              
  Lines        4332     4040     -292     
==========================================
- Hits         3677     3432     -245     
+ Misses        655      608      -47     

Files	Coverage Δ
src/debugger.rs	71.42% <ø> (+4.01%)	⬆️
src/permutation.rs	92.83% <ø> (-0.06%)	⬇️

... and 48 files with indirect coverage changes

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[HDauven]

LGTM