Update explicit_integration_schemes.py

[Microno95]

Renamed Heun's Method to Ralston's to be in line with the Wikipedia naming nomenclature. Additionally added the Heun's method that is not Ralston.

Resolves: #8

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.03%. Comparing base (34602f0) to head (2cb4e12).
⚠️ Report is 2 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage   91.01%   91.03%   +0.01%     
==========================================
  Files          22       22              
  Lines        2315     2320       +5     
  Branches      334      334              
==========================================
+ Hits         2107     2112       +5     
  Misses        139      139              
  Partials       69       69              

Flag	Coverage Δ
pr-tests-	?
pr-tests-8-fix-nomenclature-heun-and-ralston	91.03% <100.00%> (?)

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