Quickstart says to create the lib directory when it already exists

[garyrob]

In the Libraries section of the Quickstart, after the sentence "Let’s create a library directory called lib that will be the place to put our library code" is

mkdir lib

However, if the reader has been following the steps laid out so far in the tutorial, that directory already exists.

[bluddy]

Thanks for noticing this. Would you be able to offer a fix?

[garyrob]

I created PR 179 to address this.