Anders Brownworth

The Readme.md example code for minting libra doesn't create the wallet variable. This update adds that so the example works.

OSX apparently requires qrencode now.

This sentence works without this clarification (so feel free to deny) but when reading I got stuck on trying to figure out which of the two `println!()`s was being referred...

* Return option's value if it exists rather than the text of the option * If the user types something and doesn't select an option, return what was typed I...