fix: update hapi and dependencies

[nabil-money]

Description

This is a Breaking Change

• This should be considered a major update 3.0.0 as it is intentionally not backwards compatible because of the major changes in hapi (ex: async/await vs callback style handlers).
• Adds support for the latest @hapi/hapi (18.x) and related @hapi libs
• Updates and fixes example files for latest hapi change
• Updates minimum supported node version to 8.12.0 to match hapi 18's minimum version
• Updated handlers to follow new hapi convention of using h instead of reply for

How to test

If there's something I didn't test I'd be happy to review it, but I tested the following:

1. npm run example-server
2. curl all routes in routes.js and notice they all still work

Questions

• I removed localTls temporarily, hapi no longer appears to support multiple connections at a glance, though I could be wrong. Do we need this though? https://github.com/hapijs/hapi/issues/3572

[nabil-money]

Closing this out as it's over 4 months old