* update testing instructions
* new test lib: acronym
* new test lib: affine-cipher
* new test lib: armstrong-numbers
* new test lib: atbash-cipher
* new test lib: bob
* new test lib: collatz-conjecture
* new test lib: darts
* new test lib: gigasecond
* update previous exercises with date equal
* new test lib: hamming
* new test lib: hello-world
* new test lib: isogram
* new test lib: leap
* new test lib: luhn
* new test lib: pangram
* new test lib: pythagorean-triplet
* new test lib: raindrops
* new test lib: resistor-color
* new test lib: reverse-string
* new test lib: roman-numerals
* new test lib: series
* new test lib: triangle
* new test lib: trinary
* new test lib: two-fer
* new test lib: word-count
* new test lib: yacht
* SKIP-REST-OF-TESTS proof of concept for acronym exercise
* apply to rest of exercises
* markdown files must have exactly one top-level header
* rewrite help files
* re-add special words for pythagorean-triplet
