update cli code

[tjmahr]

Some of the bullets produced by aoc and usethis are inconsistent.

#> ✔ Writing 'inst/input01.txt'
#> ● Copy your problem input into this file
#> ✔ Writing 'tests/testthat/test-day01.R'
#> • Edit 'tests/testthat/test-day01.R'

Now that Windows can do UTF-8, we can probably do better?