Version 2.0.2

Patch

• Updated dependencies.
• Added a changelog.
• Dropped Yarn in favor of npm@5. Removed yarn.lock and updated install instructions.
• Set targeted Node version as a string for babel-preset-env.
• New ESLint config. Dropped Standard Style and began using Prettier.
• Using lint-staged to ensure contributors don't commit lint errors.
• Removed build:watch script. Use npm run build -- --watch directly.