v0.6.8

AlgebraOfGraphics v0.6.8

Diff since v0.6.7

Closed issues:

• hlines! and vlines! (#299)
• density() datalimits do not adjust for different columns (#399)

Merged pull requests:

• CompatHelper: bump compat for "RelocatableFolders" to "0.3" (#391) (@github-actions[bot])
• example for faceting with specified layout (#396) (@jfb-h)
• Update faceting.jl documentation that it must be nonnumeric (#400) (@ew-git)
• switch to choropleth (#401) (@piever)
• add some release notes (#404) (@piever)