fix: make library compatible with Node 8

[yoniholmes]

What:

Tweak to make library compatible with Node 8

Why:

I'm using your library in an environment which for reasons can only run on Node 8.

How:

A minor syntax change ensures the library works in Node 8.

Checklist:

• Tests
• Ready to be merged
  
• Added myself to contributors table
  

[codecov]

Codecov Report

Merging #587 (fe645b7) into master (3d2e0d8) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #587   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines          219       219           
  Branches        29        29           
=========================================
  Hits           219       219           

Impacted Files	Coverage Δ
src/pure.ts	100.00% <ø> (ø)

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[joshuaellis]

Thanks for the contribution! ⭐

[yoniholmes]

No problems! Thanks for the library! Cheers, Jonathan

…

On Mon, 29 Mar 2021 at 18:42, Josh ***@***.***> wrote: ***@***.**** approved this pull request. Thanks for the contribution! ⭐ — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#587 (review)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABNCDK242MAFXXQVNVYTDDTGDCZXANCNFSM4Z7XY77Q> .

[github-actions]

🎉 This PR is included in version 5.1.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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