- Switch from a single additional thread (receiving/holding a single `Arc::clone` reference) running a loop modeling 10 sequential jobs, to a loop generating 10 threads each modeling 1 job (each getting their own `Arc::clone` reference)
- use the previously ignored `for` loop var to keep the execution timing approx the same
- Print a more descriptive waiting message (taking an opportunity to use comment to disambiguate the count)
Hints are now accessible using the CLI subcommand `rustlings hint
<exercise name`.
BREAKING CHANGE: This fundamentally changes the way people interact with exercises.
Sub READMEs contain the relevant resources from the main
README of the web version. All second edition Rust Book links
were updated to the 2018 edition.
Fixed to typos in main README.md.