feat: Support rules as strings

[bebraw]

Closes #179.

[codecov-commenter]

Codecov Report

Merging #185 (be7e614) into develop (afe5581) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #185   +/-   ##
========================================
  Coverage    99.14%   99.14%           
========================================
  Files            6        6           
  Lines          233      233           
  Branches        64       64           
========================================
  Hits           231      231           
  Misses           2        2           

Impacted Files	Coverage Δ
src/types.ts	100.00% <ø> (ø)
src/index.ts	98.77% <100.00%> (ø)

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[bebraw]

Ok, included in v5.8.0.