Stat.histogram(limits=())

[Mattriks]

• I've updated the documentation to reflect these changes
• I've added an entry to NEWS.md
• I've added and/or updated the unit tests
• I've run the regression tests
• I've built the docs and confirmed these changes don't cause new errors

This PR

• Add limits=(min= , max=) to Stat.histogram (and Geom.histogram)
• closes Choose range in Geom.histogram #347

Example

using DataFrames, Distributions
gamma, beta = Gamma(2,2), Beta(2,2)
D = DataFrame(x1=rand(gamma, 10^4), x2=rand(beta,10^4))
layerf(dist, max) = layer(x->pdf(dist, x), 0, max, Geom.line, Theme(default_color="black"))

p1 = plot(D,  Coord.cartesian(xmin=0, xmax=20), layerf(gamma, 20),
    layer(x=:x1, Geom.histogram(bincount=20, density=true, limits=(min=0,))) )
p2 = plot(D, layerf(beta, 1),
    layer(x=:x2, Geom.histogram(bincount=20, density=true, limits=(min=0,max=1))) )

hstack(p1, p2)

[codecov-io]

Codecov Report

Merging #1249 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1249      +/-   ##
==========================================
+ Coverage   85.72%   85.75%   +0.03%     
==========================================
  Files          35       35              
  Lines        4118     4120       +2     
==========================================
+ Hits         3530     3533       +3     
+ Misses        588      587       -1

Impacted Files	Coverage Δ
src/geom/bar.jl	91.85% <ø> (ø)	⬆️
src/statistics.jl	90.62% <100%> (+0.01%)	⬆️
src/poetry.jl	88.88% <0%> (+1.85%)	⬆️

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