RC.0 migration guide: IDEs will throw error without a target

[jakeNiemiec]

The Typescript service will throw: Accessors are only available when targeting ECMAScript 5

The root level tsconfig.json needs any "target" over ES5 and Typescript will stop throwing errors. e.g.:
"target": "es5",

Wiki diff:
https://github.com/jakeNiemiec/angular-cli/wiki/stories-rc.0-update/_compare/efe56cf9b6e19be290a2404527ee8f65b577106a...ee9348c302d1ea6e64f43ea7c157342cfb4d8d18

[deebloo]

Fixed in master

[sumitarora]

Fixed in RC.1 #5060

[angular-automatic-lock-bot]

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