Whitespace
Allow the progress bar to have an 'unknown' amount of progress
Fix missing throttle rate in README
Add notes to the README about displaying unknown progress
Whitespace
Add note about unknown progress to the changelog
Merge branch 'feature/add-unknown-completion-ability' into development

* feature/add-unknown-completion-ability:
  Add note about unknown progress to the changelog
  Whitespace
  Add notes to the README about displaying unknown progress
  Fix missing throttle rate in README
  Allow the progress bar to have an 'unknown' amount of progress