try get stable docs to deploy

[baggepinnen]

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[JuliaControlBot]

This is an automated message.
Plots were compared to references. 11/11 images have changed, see differences below.
After pulling this PR, please update the reference images by creating a PR to ControlExamplePlots.jl here.

Difference	Reference Image	New Image
❌ 0.048
✔️ 0.011
✔️ 0.001
✔️ 0.001
✔️ 0.002
✔️ 0.001
✔️ 0.0
❌ 0.034
❌ 0.06
✔️ 0.0
✔️ 0.012

[codecov]

Codecov Report

Merging #776 (ba5e021) into master (a726079) will increase coverage by 95.23%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #776       +/-   ##
===========================================
+ Coverage    0.00%   95.23%   +95.23%     
===========================================
  Files           3        4        +1     
  Lines         292      294        +2     
===========================================
+ Hits            0      280      +280     
+ Misses        292       14      -278     

Impacted Files	Coverage Δ
src/ControlSystems.jl	100.00% <0.00%> (ø)
src/simulators.jl	87.50% <0.00%> (+87.50%)	⬆️
src/timeresp.jl	94.90% <0.00%> (+94.90%)	⬆️
src/root_locus.jl	97.10% <0.00%> (+97.10%)	⬆️

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