Ch. 8 on error handling done.
Merge branch 'master' of github.com:chrisvoncsefalvay/learn-julia-the-hard-way

* 'master' of github.com:chrisvoncsefalvay/learn-julia-the-hard-way:
  Update 03-ex0.md
  Update 03-ex0.md
  renamed to CONTRIBUTORS.md as it had markdown style, changed credit link to bio page
  minor typo fixes.
  [minor] Fixed commands formatting and minor changes.