graphql / graphql-js / 981

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Pull #384

travis-ci

Deprecated directive

This adds a new directive as part of the experimental schema language:

```
directive @deprecated(reason: String = "No longer supported") on FIELD_DEFINITION | ENUM_VALUE
```

It also adds support for this directive in the schemaPrinter and buildASTSchema.

Additionally exports a new helper `specifiedDirectives` which is encoured to be used when addressing the collection of all directives defined by the spec. The `@deprecated` directive is optimistically added to this collection. While it's currently experimental, it will become part of the schema definition language RFC.

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