jet -> turbo default

[OverLordGoldDragon]

• matplotlib dependency dropped
• jet bad turbo good
• Echirp fmin: 0.1 -> 1 -- 0.1 is too low for discretization

[codecov-commenter]

Codecov Report

Merging #43 (3f8efee) into master (ecf8c35) will decrease coverage by 0.23%.
The diff coverage is 59.09%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   92.61%   92.38%   -0.24%     
==========================================
  Files          17       17              
  Lines        3414     3428      +14     
==========================================
+ Hits         3162     3167       +5     
- Misses        252      261       +9     

Impacted Files	Coverage Δ
ssqueezepy/__init__.py	85.71% <28.57%> (-11.43%)	⬇️
ssqueezepy/visuals.py	92.24% <60.00%> (-0.56%)	⬇️
ssqueezepy/_test_signals.py	92.24% <100.00%> (ø)

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