snippets_clean: clean up snippets
In kbenoit/sophistication: Functions to help measure textual sophistication

Remove snippets that have unusual text, such as numbers.

snippets_clean(
  x,
  readability.limits = NULL,
  measure = "Flesch",
  verbose = TRUE,
  ...
)

`x`	snippet data created by `snippets_make()`
`readability.limits`	Two-element numeric vector used to filter out snippets based on readability scores. Any snippets with values outside this range will be dropped.
`measure`	the value of `measure` passed to `quanteda.textstats::textstat_readability()`
`verbose`	if `TRUE` output status messages
`...`	additional arguments passed to `quanteda.textstats::textstat_readability()`