Fixes kyclark#1
Use map function when assigning low, high in read_csv to split the string at the '-' character, and convert the strings to integers using int() function, the first map argument.
Fixes kyclark#2
Initiate empty list as wod. Use a foor loop of random.sample(exercises, ...) which creates a list of tuples. Assign 3 variables for each iteration of the loop: exercise, low, and high.
Pick a random number between low and high, and append the tuple to wod. If the easy flag is given as argument, divide reps by two. Use the int() function to convert the result to an integer.
The [[ ! -f $(WORDS) ]] && ... check short circuit evaluates to false if the file exists and exits with 1. This causes the Makefile to throw an error when make test is run for the second time, because the file is already unzipped at that time. The fixed [[ -f $(WORDS) ]] || ... check short circuit evaluates to true if the file exists and exits with 0.