Update json-schema to 0.4.0

[Antonio-Maranhao]

Overview

Update json-schema to 0.4.0 to address https://github.com/advisories/GHSA-896r-f27r-55mw

Testing recommendations

CI tests pass

GitHub issue number

n/a

Related Pull Requests

n/a

Checklist

• [x] Code is written and works correctly;
• [x] Changes are covered by tests;
• [ ] Documentation reflects the changes;
• [ ] Update rebar.config.script with the correct tag once a new Fauxton release is made

[willholley]

+1

[Antonio-Maranhao]

Not sure why Travis didn't report but the build passed:.