chore(deps): pin dependencies (#1809)
chore(deps): pin dependencies (#1809)

This PR contains the following updates:

| Package | Type | Update | Change | References |
|---|---|---|---|---|
| @types/node-fetch | devDependencies | pin | `^2.1.2` -> `2.1.2` | [source](https://renovatebot.com/gh/DefinitelyTyped/DefinitelyTyped) |
| @types/request-promise | devDependencies | pin | `^4.1.42` -> `4.1.42` | [source](https://renovatebot.com/gh/DefinitelyTyped/DefinitelyTyped) |
| @types/test-listen | devDependencies | pin | `^1.1.0` -> `1.1.0` | [source](https://renovatebot.com/gh/DefinitelyTyped/DefinitelyTyped) |
| @types/type-is | devDependencies | pin | `^1.6.2` -> `1.6.2` | [source](https://renovatebot.com/gh/DefinitelyTyped/DefinitelyTyped) |
| @types/ws | devDependencies | pin | `^6.0.1` -> `6.0.1` | [source](https://renovatebot.com/gh/DefinitelyTyped/DefinitelyTyped) |

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apollostack/apollo-server