update package.json dependencies

[jdillard]

https://david-dm.org/jdillard/personal-site

[jdillard]

Upgraded most of them, here is what is left:

• node-sass - waiting on Security issue in dependencies sass/node-sass#2355
• webpack - waiting on chunk-manifest-webpack-plugin
• chunk-manifest-webpack-plugin - waiting on add support for webpack v4 soundcloud/chunk-manifest-webpack-plugin#55
• d3 - waiting on rain in graph for testing purposes

[jdillard]

npm packages with vulnerabilities have been updated, so closing for now.