Features
- Added `sort_by` command, see 17 (guilhermeleobas)
- Added `take_while` command, see 20
- Added `foldl1` command, see 6 (guilhermeleobas)
- Added lazy evaluation, see README
- Added `--negate` flag to `filter` and `take_while`, see 25 (vegarsti)
- Added new string functions `format`, `ends_with`, see 7 (vegarsti)
- Added new math functions `pow`, `even`, `odd`, see 7.
Bugfixes
- Properly handle broken pipes
- Fix in `int` parsing