Update cw-2.py
Update cw-2.py

Replaced `true` and `false` with their correct, capitalized Python alternatives in `Test.expect_error`!
xcthulhu/codewars-runner,remotty/cdr,remotty/cdr,remotty/cdr,xcthulhu/codewars-runner,remotty/cdr,remotty/cdr,xcthulhu/codewars-runner,xcthulhu/codewars-runner,remotty/cdr,xcthulhu/codewars-runner,remotty/cdr