add blurb regarding potential conflicts when loading dplyr

[LiNk-NY]

The vignette should have a section near the top that recommends the conflicted package to new users and recommends them to run the vignette code in a fresh R session

@bd4everyone

[bd4everyone]

Please use a fresh R session to minimise package conflicts arising from identical function names.
For example the functions filter(), results() are available with R packages dplyr, GenomicDataCommons . Instead consider using the R package conflicted.
Example usage
conflicts_prefer(dplyr::filter())
conflicts_prefer(GenomicDataCommons::filter)
conflicts_prefer(stats :: filter)