Streamplot fix

[henry2004y]

Use Float64 range to satisfy streamplot even space checking.

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 65.63%. Comparing base (ec0137c) to head (5ba6618).
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/plot/pyplot.jl	42.85%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   65.63%   65.63%           
=======================================
  Files          12       12           
  Lines        2401     2401           
=======================================
  Hits         1576     1576           
  Misses        825      825           

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