Updates Travis to use the latest PureScript version in CI, also removing PureScript from the dev dependencies so that it isn't inadvertently installed and used by NPM. Also bumps NPM dev dependency versions. For more details, see this Discourse post.
What does this pull request do?
Updates Travis to use the latest PureScript version in CI, also removing PureScript from the dev dependencies so that it isn't inadvertently installed and used by NPM. Also bumps NPM dev dependency versions. For more details, see this Discourse post.