Webstorm instructions should reference eslint-config-standard-jsx
Webstorm instructions should reference eslint-config-standard-jsx

The Webstorm instructions don't tell users to install
[eslint-config-standard-jsx](https://github.com/feross/eslint-config-sta
ndard-jsx). That's fine, but they're not getting the full set of rules
that `standard` includes for JSX.

JedWatson/happiness,SimenB/standard,JedWatson/happiness,LinusU/standard,LinusU/standard,standard/standard,feross/standard,feross/standard,SimenB/standard,standard/standard