update readme before release

[baggepinnen]

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[JuliaControlBot]

This is an automated message.
Plots were compared to references. 9/11 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
✔️ 0.003
✔️ 0.003
✔️ 0.001
✔️ 0.001
✔️ 0.0
✔️ 0.0
❌ 0.042
✔️ 0.006
✔️ 0.011

[codecov]

Codecov Report

Merging #634 (1b7a9f6) into master (f368360) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #634   +/-   ##
=======================================
  Coverage   86.73%   86.73%           
=======================================
  Files          31       31           
  Lines        3248     3248           
=======================================
  Hits         2817     2817           
  Misses        431      431           

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