Rely on Git more than on console output

[katrinleinweber]

• to decouple lesson from usethis output, remove

  FAIR-R/_episodes_rmd/05-testthat.Rmd

  Lines 55 to 64 in 7870a80

  	A new file should be created and the console should show:
  	~~~
  	✔ Adding 'testthat' to Suggests field in DESCRIPTION
  	✔ Creating 'tests/testthat/'
  	✔ Writing 'tests/testthat.R'
  	✔ Writing 'tests/testthat/test-center.R'
  	● Modify 'test-center.R'
  	~~~
  	{: .source}

• change description to review changes in Git diff