update readme

[winitzki]

Implement type aliases.

[codecov]

Codecov Report

Merging #10 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   94.57%   94.58%   +0.01%     
==========================================
  Files           6        6              
  Lines         535      536       +1     
  Branches       31       35       +4     
==========================================
+ Hits          506      507       +1     
  Misses         29       29

Impacted Files	Coverage Δ
src/main/scala/io/chymyst/ch/Macros.scala	100% <100%> (ø)	⬆️

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