Fix Step2 dependency clone instructions

Looks like the DemandCubePlaybooks were changed to DeveloperPlaybooks. 

This commit adjusts step 2 to account for the changes.
adjust directory path

Correcting readme to reflect need to go up 2 directories instead of just 1.
Merge pull request #8 from lazaruslarue/fix-step2-readme-developer-playbook-code-sample

Fix step2 readme developer playbook code sample