fix(policy): update regex to allow optional scope

[andrewrynhard]

No description provided.

[codecov]

Codecov Report

Merging #61 into master will decrease coverage by 3.13%.
The diff coverage is 42.85%.

@@            Coverage Diff            @@
##           master     #61      +/-   ##
=========================================
- Coverage   69.04%   65.9%   -3.14%     
=========================================
  Files           1       1              
  Lines          42      44       +2     
=========================================
  Hits           29      29              
- Misses         10      11       +1     
- Partials        3       4       +1

Impacted Files	Coverage Δ
...kg/policy/conventionalcommit/conventionalcommit.go	65.9% <42.85%> (-3.14%)	⬇️

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