Update dependencies

[ah01]

Dependencies in package.json are little bit out of date...

npm WARN deprecated babel-preset-es2015@6.24.1: 🙌  Thanks for using Babel: we recommend using babel-preset-env now: please read babeljs.io/env to update! 
npm WARN engine grunt-babel@8.0.0: wanted: {"node":">=6.9"} (current: {"node":"4.9.1","npm":"2.15.11"})
npm WARN peerDependencies The peer dependency @babel/core@^7.0.0 included from grunt-babel will no
npm WARN peerDependencies longer be automatically installed to fulfill the peerDependency 
npm WARN peerDependencies in npm 3+. Your application will need to depend on it explicitly.
npm WARN engine @babel/core@7.3.3: wanted: {"node":">=6.9.0"} (current: {"node":"4.9.1","npm":"2.15.11"})
npm WARN engine grunt-legacy-util@1.1.1: wanted: {"node":">= 6"} (current: {"node":"4.9.1","npm":"2.15.11"})
npm WARN deprecated browserslist@1.7.7: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.
npm WARN engine grunt-legacy-log-utils@2.0.1: wanted: {"node":">=6"} (current: {"node":"4.9.1","npm":"2.15.11"})
npm WARN engine json5@2.1.0: wanted: {"node":">=6"} (current: {"node":"4.9.1","npm":"2.15.11"})
npm WARN engine @babel/parser@7.3.3: wanted: {"node":">=6.0.0"} (current: {"node":"4.9.1","npm":"2.15.11"})
npm WARN optional dep failed, continuing fsevents@1.2.7
npm WARN optional dep failed, continuing fsevents@1.2.7
npm WARN engine har-validator@5.1.3: wanted: {"node":">=6"} (current: {"node":"4.9.1","npm":"2.15.11"})
npm WARN engine punycode@2.1.1: wanted: {"node":">=6"} (current: {"node":"4.9.1","npm":"2.15.11"})