• Updated dependencies.
• Use .prettierignore to defer package.json formatting to npm.
• Renamed .babelrc.js to babel.config.js and simplified ESLint ignore config.
• Improved linting with eslint-config-env.
• Use the .mjs extension for source.
• Added JSDoc comments to source.
• Refactored package scripts:
  • Use prepare to support installation via Git (e.g. npm install jaydenseric/apollo-upload-client).
  • Remove rimraf and cross-env dev dependencies. Only *nix environments will be supported for contributing.
  • Removed watch and fix scripts.
• Compact package repository field.
• Setup Travis CI.
• Readme badge changes to deal with shields.io unreliability:
  • Removed the licence badge. The licence can be found in package.json and rarely changes.
  • Removed the Github issues and stars badges. The readme is most viewed on Github anyway.
  • Added the more reliable build status badge provided by Travis and placed it first as it loads the quickest.