* masterd: (24 commits)
  Add TypeScript linting support (facebook#6513)
  Support React Hooks (facebook#5602) (facebook#5997)
  Support browserslist in @babel/preset-env (facebook#6608)
  Add empty mock for http2 (facebook#5686)
  Add note about npx caching (facebook#6374)
  change named import into default import (facebook#6625)
  Stage files for commit after ejecting (facebook#5960)
  Upgrade dependencies (facebook#6614)
  Make compiler variable const instead of let (facebook#6621)
  Type check JSON files (facebook#6615)
  Change class components to functional components in templates (facebook#6451)
  Convert JSON.stringify \n to os.EOL when writing tsconfig.json (facebook#6610)
  Update html-webpack-plugin (facebook#6361)
  Enable click to go to error in console for TypeScript (facebook#6502)
  Update webpack-dev-server to 3.2.1 (facebook#6483)
  [docs] revert removal of newlines from html (facebook#6386)
  Publish
  Prepare 2.1.8 release
  Reapply "Speed up TypeScript v2 (facebook#6406)" (facebook#6586)
  Publish
  ...

# Conflicts:
#	packages/babel-preset-react-app/create.js
#	packages/react-scripts/scripts/build.js