get docs to auto build again

[bjarthur]

per https://github.com/marketplace/actions/julia-tagbot#personal-access-tokens

[bjarthur]

i've also manually added a git tag for 1.2 since tagbot inexplicably failed.

[codecov-io]

Codecov Report

Merging #1397 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1397      +/-   ##
==========================================
- Coverage   90.32%   90.26%   -0.06%     
==========================================
  Files          39       39              
  Lines        4060     4242     +182     
==========================================
+ Hits         3667     3829     +162     
- Misses        393      413      +20

Impacted Files	Coverage Δ
src/geom/rectbin.jl	80.55% <0%> (-6.95%)	⬇️
src/poetry.jl	90.74% <0%> (-5.26%)	⬇️
src/geom/label.jl	96.26% <0%> (-2.74%)	⬇️
src/geom/beeswarm.jl	90% <0%> (-2.65%)	⬇️
src/guide/keys.jl	84.03% <0%> (-1.32%)	⬇️
src/scale/scales.jl	88.7% <0%> (-1.13%)	⬇️
src/guide.jl	90.64% <0%> (-0.27%)	⬇️
src/aesthetics.jl	81.3% <0%> (-0.22%)	⬇️
src/statistics.jl	96.92% <0%> (-0.01%)	⬇️
src/shapes.jl	100% <0%> (ø)	⬆️
... and 13 more

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