Change to 2019 files, use official PSID codebook

[aaowens]

No description provided.

[codecov-commenter]

Codecov Report

Merging #43 (dcfc056) into master (b81ca82) will increase coverage by 1.74%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
+ Coverage   37.72%   39.46%   +1.74%     
==========================================
  Files           7        6       -1     
  Lines         281      299      +18     
==========================================
+ Hits          106      118      +12     
- Misses        175      181       +6     

Impacted Files	Coverage Δ
src/construct_alldata.jl	0.00% <0.00%> (ø)
src/unzip_data.jl	0.00% <0.00%> (ø)
src/process_codebook.jl	96.96% <100.00%> (+0.09%)	⬆️
src/PSID.jl
src/use_codebook.jl	97.40% <0.00%> (+0.30%)	⬆️
src/init.jl	46.15% <0.00%> (+4.48%)	⬆️
src/types.jl	83.33% <0.00%> (+50.00%)	⬆️

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