Add ProjectTo for CA

[avik-pal]

Ensures that the gradient of a CA is of type CA.

[codecov-commenter]

Codecov Report

Merging #202 (d654990) into master (efff2cd) will increase coverage by 0.11%. The diff coverage is 66.66%.

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@@            Coverage Diff             @@
##           master     #202      +/-   ##
==========================================
+ Coverage   73.35%   73.46%   +0.11%     
==========================================
  Files          20       20              
  Lines         683      686       +3     
==========================================
+ Hits          501      504       +3     
  Misses        182      182              

Impacted Files	Coverage Δ
src/compat/chainrulescore.jl	81.81% <66.66%> (+6.81%)	:arrow_up:

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[jonniedie]

Thanks!

[jonniedie]

@JuliaRegistrator register

[JuliaRegistrator]

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[avik-pal]

@jonniedie this patch did not get released