phrb/ExperimentalDesign.jl: v0.4.1

Diff since v0.4.0

Merged pull requests:

• add fold! method (#22) (@joergbuchwald)
• add fraction factorial 2-level design (#32) (@joergbuchwald)
• Latin Hypercube sampling design (LHS) (#33) (@joergbuchwald)
• CompatHelper: add new compat entry for "LatinHypercubeSampling" at version "1.8" (#34) (@github-actions[bot])
• add central composite design (#35) (@joergbuchwald)
• add Box Behnken response surface design (#36) (@joergbuchwald)
• fix LHS export/docstrings (#37) (@joergbuchwald)
• CompatHelper: add new compat entry for "Combinatorics" at version "1.0" (#38) (@github-actions[bot])
• update readme (#39) (@joergbuchwald)
• fix link and typo (#40) (@joergbuchwald)
• Add Examples in doc, change Project.toml, add tast and #43 (#43) (@PharmCat)