MAINT: Rename RandomGenerator to Generator

[bashtage]

Rename to reflect upstream decision

[codecov]

Codecov Report

Merging #96 into 1.17.0 will increase coverage by <.01%.
The diff coverage is 99.1%.

@@            Coverage Diff             @@
##           1.17.0      #96      +/-   ##
==========================================
+ Coverage   93.43%   93.43%   +<.01%     
==========================================
  Files          26       26              
  Lines        7880     7881       +1     
  Branches      121      121              
==========================================
+ Hits         7363     7364       +1     
  Misses        497      497              
  Partials       20       20

Impacted Files	Coverage Δ
randomgen/mtrand.pyx	90.18% <ø> (ø)	⬆️
randomgen/pcg64.pyx	82.92% <100%> (ø)	⬆️
randomgen/pcg32.pyx	79.41% <100%> (ø)	⬆️
randomgen/tests/test_direct.py	98.23% <100%> (ø)	⬆️
randomgen/xoshiro512starstar.pyx	79.16% <100%> (ø)	⬆️
randomgen/threefry32.pyx	82.92% <100%> (ø)	⬆️
randomgen/xorshift1024.pyx	79.59% <100%> (ø)	⬆️
randomgen/tests/test_generator_mt19937.py	99.3% <100%> (ø)	⬆️
randomgen/generator.pyx	91.4% <100%> (+0.01%)	⬆️
randomgen/tests/test_against_numpy.py	99.28% <100%> (ø)	⬆️
... and 10 more

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