Add Replace

[eliascarv]

This PR implements Replace tranformation. The Replace(oldᵢ => newᵢ) transformations replaces all occurrences of oldᵢ with newᵢ in the table.

Note: If the type of old is different from the type of new, the column type is changed to a type common to the new column elements, without promotion.
Example:

julia> using TableTransforms, DataFrames

julia> df = DataFrame(a = [2, 1, 2], b = [1, 1, 1])
3×2 DataFrame       
 Row │ a      b     
     │ Int64  Int64 
─────┼──────────────
   1 │     2      1 
   2 │     1      1 
   3 │     2      1 

julia> T = Replace(1 => 1.5)
Replace{Int64, Float64}(IdDict(1 => 1.5))

julia> T(df)
3×2 DataFrame
 Row │ a     b       
     │ Real  Float64 
─────┼───────────────
   1 │  2        1.5
   2 │  1.5      1.5
   3 │  2        1.5

[codecov-commenter]

Codecov Report

Merging #42 (2f87e1d) into master (af0128a) will increase coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
+ Coverage   92.69%   92.85%   +0.15%     
==========================================
  Files          18       19       +1     
  Lines         452      462      +10     
==========================================
+ Hits          419      429      +10     
  Misses         33       33              

Impacted Files	Coverage Δ
src/transforms.jl	97.82% <ø> (ø)
src/transforms/replace.jl	100.00% <100.00%> (ø)

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[juliohm]

Need to resolve newly added conflicts with master.

[juliohm]

The IdDict trick was clever 💯

[eliascarv]

The IdDict trick was clever 💯

Thanks @juliohm!

[eliascarv]

Can I merge when tests pass @juliohm?

[juliohm]

Yes, feel free to merge when all green tickets show up. 👍🏽