feat: allow "standard" pre-1.0.0 patch bumps

[joeldodge79]

opt-in behavior for pre-1.0.0 packages that want to follow the standard
conventional commits behavior of bumping the patch instead of the minor

the motivation for this change is compatibility for node package dependencies with versions < 1.0.0 using Caret Ranges

[codecov]

Codecov Report

Merging #847 (f87de53) into master (2799647) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #847      +/-   ##
==========================================
+ Coverage   93.75%   93.77%   +0.01%     
==========================================
  Files          64       64              
  Lines        9181     9203      +22     
  Branches      933      988      +55     
==========================================
+ Hits         8608     8630      +22     
  Misses        570      570              
  Partials        3        3              

Impacted Files	Coverage Δ
src/bin/release-please.ts	93.07% <100.00%> (+0.17%)	⬆️
src/conventional-commits.ts	99.20% <100.00%> (+0.01%)	⬆️
src/index.ts	100.00% <100.00%> (ø)
src/manifest.ts	100.00% <100.00%> (ø)
src/release-pr.ts	94.49% <100.00%> (+0.02%)	⬆️
src/releasers/node.ts	100.00% <100.00%> (ø)
src/releasers/python.ts	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2799647...f87de53. Read the comment docs.