Update practices and deps to 2018-06-20

[chaimleib]

Updates to latest React practice:

• React.PropTypes was removed, and is now available in the prop-types package

Resolves these warnings during npm install (or yarn install):

• Deprecation of babel-preset-es2015 and babel-preset-stage-2 in favor of babel-preset-env

  npm WARN deprecated [email protected]: 🙌 Thanks for using Babel: we recommend using babel-preset-env now: please read babeljs.io/env to update!

• RegExp DoS issue in babel-core > minimatch

  npm WARN deprecated [email protected]: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue