Flow chart needs updated per Baas migration in composite API appendix lab

[krisrowe]

https://github.com/apigee/apijam/blob/master/Labs/Appendix/API%20Development%20-%20Composite%20APIs/media/image_0.png

Note that two of the steps are specific to BaaS, for building a BaaS query, and should be replaced with a single step to add latitude and longitude query string parameters before calling target endpoint.