fix forwarding of beta kwarg in quantile!(::AbstractArray...)

[MasonProtter]

Closes #204

Before:

julia> quantile!(reshape([1.,2,3,4,5],5,1), [.25,.5,.75]; alpha=0, beta=1) ≈ quantile!([1.,2,3,4,5], [.25,.5,.75]; alpha=0, beta=1)
false

after

julia> quantile!(reshape([1.,2,3,4,5],5,1), [.25,.5,.75]; alpha=0, beta=1) ≈ quantile!([1.,2,3,4,5], [.25,.5,.75]; alpha=0, beta=1)
true

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.43%. Comparing base (ad4a0cd) to head (67f838b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   96.43%   96.43%           
=======================================
  Files           2        2           
  Lines         449      449           
=======================================
  Hits          433      433           
  Misses         16       16           

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[DilumAluthge]

@andreasnoack or @nalimilan - could you review this?

[nalimilan]

Woops. Thanks!

[MasonProtter]

What is needed in order to have this bugfix backported for previous julia versions?

[DilumAluthge]

On mobile, but some quick notes:

1. For each Julia version of interest, go to the JuliaLang/julia repo and go to the relevant backports-release-* branch. If the backports branch doesn't exist, go to release-*. Go to stdlib/Statistics.version and write down the commit sha.
2. Come to this repo (the Statistics.jl repo). For each Julia version of interest, create a release-* branch off of the correct commit sha (which was determined in the previous step). Some of the release branches might exist already.
3. In this repo, create backports-release-* off of the top of release-*.
4. In this repo, cherry-pick the desired commits into backports-release-*. E.g. for this PR, the commit to cherry-pick is e14c8f8. Please include the -x flag when cherry-picking.
5. In this repo, make a PR to merge backports-release-* into release-*. Get that PR approved and merged.
6. In the JuliaLang/julia repo, on the backports-release-* branch, edit stdlib/Statistics.version so that the specified branch is release-* (not master).
7. Trigger BumpStdlibs.jl on the backports-release-* branch in the Julia repo.
8. Wait for the backports PR in the Julia repo to be merged.