v0.2.2

Mostly minor update:

• Fix bug where non-overlapping but non-linearly ordered levels in split_by() (e.g. 1:2 ~ 5:6 ~ 3:4) would be incorrectly detected as overlapping and give an error
• Properly export the walrus operator (rlang::`:=`) for quasiquotation in functions
• Simplify and correct typos in documentation
• Restyle the links in the info tab of the shiny app