[node] correct SlowBuffer

[Flarna]

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code. (Compile and run.)
• Add or edit tests to reflect the change. (Run with npm test.)
• Follow the advice from the readme.
• Avoid common mistakes.
• Run npm run lint package-name (or tsc if no tslint.json is present).
• Provide a URL to documentation or source code which provides context for the suggested changes: https://nodejs.org/dist/latest-v11.x/docs/api/buffer.html#buffer_class_slowbuffer
  https://nodejs.org/dist/latest-v11.x/docs/api/globals.html (no SlowBuffer there)
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Removed SlowBuffer from global as it doesn't exist there.
Remove non existing constructors.

[typescript-bot]

@Flarna Thank you for submitting this PR!

🔔 @microsoft @DefinitelyTyped @jkomyno @a-tarasyuk @alvis @r3nya @BrunoScheufler @smac89 @tellnes @DeividasBakanas @eyqs @Hannes-Magnusson-CK @KSXGitHub @hoo29 @kjin @ajafff @islishude @mwiktorczyk @matthieusieben @mohsen1 @n-e @octo-sniffle @parambirs @eps1lon @SimonSchick @ThomasdenH @WilcoBakker @wwwy3y3 @ZaneHannanAU @jeremiergz @samuela @kuehlein - please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.

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[typescript-bot]

Since you're a listed owner and the build passed, this PR is fast-tracked. A maintainer will merge shortly. If it shouldn't be merged yet, please leave a comment saying so and we'll wait. Thank you for your contribution to DefinitelyTyped!

[Flarna]

@sandersn Seems CI for node is broken again...

Error in ledgerhq__hw-transport
Error: /home/travis/build/DefinitelyTyped/DefinitelyTyped/types/ledgerhq__hw-transport/ledgerhq__hw-transport-tests.ts:6:1
ERROR: 6:1  expect  Expected type to be:
  Promise<ReadonlyArray<string>>
got:
  Promise<readonly string[]>
    at /home/travis/build/DefinitelyTyped/DefinitelyTyped/node_modules/dtslint/bin/index.js:161:19
    at Generator.next (<anonymous>)
    at fulfilled (/home/travis/build/DefinitelyTyped/DefinitelyTyped/node_modules/dtslint/bin/index.js:5:58)
    at <anonymous>

Is this an expected change from typescript side? Maybe microsoft/TypeScript#29435?

[typescript-bot]

@Flarna The Travis CI build failed! Please review the logs for more information.

Once you've pushed the fixes, the build will automatically re-run. Thanks!

[typescript-bot]

@Flarna The Travis CI build failed! Please review the logs for more information.

Once you've pushed the fixes, the build will automatically re-run. Thanks!

[typescript-bot]

@Flarna The Travis CI build failed! Please review the logs for more information.

Once you've pushed the fixes, the build will automatically re-run. Thanks!

[typescript-bot]

I just published @types/node@10.12.23 to npm.