Update dependency promise-readable to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
promise-readable	devDependencies	major	^4.2.1 -> ^5.0.1

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Release Notes

dex4er/js-promise-readable

v5.0.1

Compare Source

• Minor tweaks in README.

v5.0.0

Compare Source

• PromiseReadable implements AsyncIterable so it is possible to use
  for await (const chunk of promiseReadable) loop.
• New method iterate is provided.

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[coveralls]

Coverage increased (+0.6%) to 72.477% when pulling 6cb6af9 on renovate/promise-readable-5.x into fb4af27 on master.