Upgrade joi due to deprecation warning

[Pajn]

Library Affected:
workbox-webpack-plugin, workbox-build, probably others.

Browser & Platform:
n/a

Issue or Feature Request Description:
When I install packages today I get:

warning workbox-webpack-plugin > workbox-build > joi@14.3.1: This module has moved and is now available at @hapi/joi. Please update your dependencies as this version is no longer maintained an may contain bugs and security issues.
warning workbox-webpack-plugin > workbox-build > joi > topo@3.0.3: This module has moved and is now available at @hapi/topo. Please update your dependencies as this version is no longer maintained an may contain bugs and security issues.
warning workbox-webpack-plugin > workbox-build > joi > hoek@6.1.3: This module has moved and is now available at @hapi/hoek. Please update your dependencies as this version is no longer maintained an may contain bugs and security issues.
warning workbox-webpack-plugin > workbox-build > joi > topo > hoek@6.1.3: This module has moved and is now available at @hapi/hoek. Please update your dependencies as this version is no longer maintained an may contain bugs and security issues.

When reporting bugs, please include relevant JavaScript Console logs and links to public URLs at which the issue could be reproduced.

[philipwalton]

Thanks, @jeffposnick when you're back can you take a look and make sure workbox-build is compatible with the new version?

[jeffposnick]

Unfortunately, I can't find any release notes for v15, so I'm going to assume it was mainly a breaking semver change due to the renamed npm package.