Maint: Update changelog and version to 0.4.21

[eddiebergman]

Version 0.4.21

• Add Add: Binary wheels #224: Now builds binary wheels for Windows/Mac/Linux, available on PyPI.
• Maint Add: Windows and mac testing #227: Include automated testing for windows and mac.
• Maint Fix: i686 test difference test_normalfloat #228: Fix #225: almost_equal on get_neighbours test #226: Account for test differences with i686 architectures.
• Maint Fix double github action test triggers #213, Fix double triggers of workflows, add spacing to steps #215: Prevent double trigger of github workflows.
• Fix Fixes equality with ordering of hyperparameters #212: Equality (==) on CategoricalHyperparameter objects are now invariant to ordering.
• Add Add get_size() #208: ConfigurationSpace::estimate_size() to get the size of a configuration space without considering constraints.
• Add Make print(config) friendlier for copy-paste #210: print(config) is now produces a string representation of a valid python dictionary that is suitable for copy and paste.
• Fix add check for pcs_new read #203: Parser for pcs files now correctly coverts types for forbidden clauses, checking for the validaty as well.
• Maint #f71508c: Clean up in README.md and fix link for new SMAC example docs.
• Fix Fix #186: do not underflow if q is provided in an edge-case #202: Fix numerical underflow when performing quantization of log sampled UniformFloat.
• Add support for truncated normal distribution #188: Support for a truncated NormalIntegerHyperparameter or NormalFloatHyperparameter by providing lower and upper bounds.
• Fix Check new neighbors deterministically #195: Sampling configurations to perform validity checks for during get_one_exchange_neighborhood is now deterministic w.r.t. a seed.

[codecov]

Codecov Report

Merging #233 (570d677) into master (2e6f459) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #233   +/-   ##
=======================================
  Coverage   67.11%   67.11%           
=======================================
  Files          17       17           
  Lines        1627     1627           
=======================================
  Hits         1092     1092           
  Misses        535      535           

Impacted Files	Coverage Δ
ConfigSpace/__version__.py	100.00% <100.00%> (ø)

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