Deprecated npm packages

[BigNom]

Just ran npm install and there are several depreciated npm packages that need updating/replacing.
circular-json@0.3.3
postinstall-build@5.0.3
url-search-params@1.1.0
joi@13.7.0
sw-precache@5.2.1
hoek@5.0.4
topo@3.0.3
sw-toolbox@3.6.0
core-js@1.2.7
browserslist@1.7.7
hoek@6.1.3
flatten@1.0.2

[calebmshafer]

Thanks @BigNom. I will let the team know and we will work on updating to the recommended new packages.