prettierx: Update get-stream -> 6.0.0 - dependency

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
get-stream	dependencies	major	5.2.0 -> 6.0.0

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Release Notes

sindresorhus/get-stream

v6.0.0

Compare Source

Breaking

• Require Node.js 10 80165c1

Breaking for TypeScript users

• Only use a CommonJS export for the TypeScript definition (reason)
  You need to change import getStream from 'get-stream'; to import getStream = require('get-stream');

Improvements

• Use native stream.pipeline instead of pump package (#​39) 5cf31ba

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