feat!: Remove custom error from `assert` and `ensure`

[lambdalisue]

Close #125

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 99.89%. Comparing base (6f1acaa) to head (a2fd842). :warning: Report is 3 commits behind head on v5-pre.

Additional details and impacted files

@@            Coverage Diff             @@
##           v5-pre     #130      +/-   ##
==========================================
- Coverage   99.89%   99.89%   -0.01%     
==========================================
  Files          52       52              
  Lines         954      943      -11     
  Branches      120      118       -2     
==========================================
- Hits          953      942      -11     
  Misses          1        1              

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