chore(deps): bump loopback-boot from 2.28.0 to 3.3.1 in /api-server

[dependabot[bot]]

Bumps loopback-boot from 2.28.0 to 3.3.1.

Changelog

Sourced from loopback-boot's changelog.

2019-06-24, Version 3.3.1

• chore: update LTS status (Diana Lau)

• chore: update copyrights years (Agnes Lin)

2019-03-28, Version 3.3.0

• chore: upgrade deps to avoid npm audit warnings (Raymond Feng)

2019-03-22, Version 3.2.1

• fix: set app.booting flag immediately (Miroslav Bajtoš)

• fix: update lodash (jannyHou)

2018-10-18, Version 3.2.0

• README: update LTS status (Miroslav Bajtoš)

• Add support for es6 modules for boot scripts (Walker)

2018-07-26, Version 3.1.1

• update: dependency (jannyHou)

• chore: update dependencies (Diana Lau)

• [WebFM] cs/pl/ru translation (candytangnb)

• chore: update license (Diana Lau)

• CODEOWNERS: move @lehni to Alumni section (Miroslav Bajtoš)

• Add support for ES6 style async boot scripts (Jürg Lehni)

2017-10-13, Version 3.1.0

• update strong-globalize to 3.1.0 (shimks)

... (truncated)

Commits

• 59e46b3 3.3.1
• 8bb4368 Merge pull request #292 from strongloop/lts
• a1d2954 chore: update LTS status
• 837b818 Merge pull request #290 from strongloop/copyrights
• ef39abf chore: update copyrights years
• 8587dd6 3.3.0
• 561cbd5 Merge pull request #289 from strongloop/upgrade-deps
• 02da15c chore: upgrade deps to avoid npm audit warnings
• 17ba74e 3.2.1
• e73b90e Merge pull request #286 from strongloop/fix/booting-flag
• Additional commits viewable in compare view

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