build: include node v16

[ghost]

Description

This PR closes #311 by updating the engines fields without code changes.

References:

• notable-changes in v16

Motivation and Context

Node v16 Active LTS Start: 2021-10-26

How has this been tested?

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [ ] Add tests to cover changes as needed.
• [ ] Update documentation as needed.

[codecov-commenter]

Codecov Report

Merging #389 (cfe997e) into dev (0c2a7f9) will not change coverage. The diff coverage is n/a.

:exclamation: Current head cfe997e differs from pull request most recent head 84c9dce. Consider uploading reports for the commit 84c9dce to get more accurate results

@@           Coverage Diff           @@
##              dev     #389   +/-   ##
=======================================
  Coverage   80.92%   80.92%           
=======================================
  Files          43       43           
  Lines        1798     1798           
  Branches      327      328    +1     
=======================================
  Hits         1455     1455           
  Misses        342      342           
  Partials        1        1           

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[bb111189]

Let's add to travis too @noel-yoo