chore(deps): update dependency into-stream to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
into-stream	devDependencies	major	5.1.1 -> 6.0.0

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Release Notes

sindresorhus/into-stream

v6.0.0

Compare Source

Breaking

• Require Node.js 10 0d08ee4

Breaking for TypeScript users

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

Enhancements

• Support async iterables (#​16) 62f1ed7
• Allow arrays of arrays in intoStream.object TypeScript type definition (#​15) ef2b8dc

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