fix lint errors please

[tomByrer]

Fresh, git clone & build, last commit: c4eee2c Dec 2019

Thanks for your repo! :)

yarn run lint
yarn run v1.22.1
$ eslint --config .eslintrc "./**/*.js"
Warning: React version not specified in eslint-plugin-react settings. See https://github.com/yannickcr/eslint-plugin-react#configuration .

D:\doc\prog\pm\react-live\demo\components\Header.js
  4:30  error  Unable to resolve path to module 'formidable-oss-badges'  import/no-unresolved

D:\doc\prog\pm\react-live\demo\components\LiveEdit.js
   6:66  error    Unable to resolve path to module 'react-live'  import/no-unresolved
  76:21  warning  'noInline' is missing in props validation      react/prop-types
  76:31  warning  'code' is missing in props validation          react/prop-types

D:\doc\prog\pm\react-live\src\components\Editor\index.js
  64:13  error  '_code' is assigned a value but never used     no-unused-vars
  65:7   error  'onChange' is assigned a value but never used  no-unused-vars
  66:7   error  'language' is assigned a value but never used  no-unused-vars

D:\doc\prog\pm\react-live\src\components\Live\LivePreview.js
  4:24  warning  'Component' is missing in props validation  react/prop-types

D:\doc\prog\pm\react-live\stories\Live.js
  137:26  warning  'live' is missing in props validation          react/prop-types
  138:23  warning  'live.element' is missing in props validation  react/prop-types
  143:18  warning  'live.error' is missing in props validation    react/prop-types

✖ 11 problems (5 errors, 6 warnings)