Update versions to handle new json-server dist rename

[coryhouse]

Update Flux course versions. Json-server renamed dist to public in .16:

The api server wasn't starting in 3rd module. The reason was due to the below static line pointing to dist folder in apiServer.js instead of public .
Line present in the file - static: "node_modules/json-server/dist",
The new modified line that works - static: "node_modules/json-server/public",