docs: document version support goals

[bcoe]

No description provided.

[codecov]

Codecov Report

Merging #551 into master will decrease coverage by 0.2%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #551      +/-   ##
==========================================
- Coverage   99.79%   99.59%   -0.21%     
==========================================
  Files           5        5              
  Lines        1955     1955              
  Branches      172      171       -1     
==========================================
- Hits         1951     1947       -4     
- Misses          4        7       +3     
- Partials        0        1       +1

Impacted Files	Coverage Δ
src/service.ts	99.23% <0%> (-0.39%)	⬇️
src/util.ts	99.32% <0%> (-0.34%)	⬇️

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