✨ Add LTS node version (16) to acceptable engines.

[johnschult]

Node 16 is now LTS. This broke our build since we use the node:lts-alpine docker image.

[sounisi5011]

Sorry I left this up for so long!
The CI for this project is probably already broken; we will merge and release it after we fix the CI.

[sounisi5011]

This PR cannot be merged for the following reasons:

• README.md file has not been updated

  In this repository, README.md files are automatically generated from .template/readme.njk.
  When you change the engines field, the contents of the README.md file should also be automatically updated.
  However, the README.md file is not updated in this PR.
  Probably because you did not execute the npm install command.

  You need to commit the updated README.md file by doing the following:

  1. Install Node.js

  2. Run the npm install command in the root directory of this repository

  3. Run the npm run build:readme command in this repository

  4. Commit updated README.md file

     Note
     I would recommend adding the --no-verify option to the git commit command.
     This is because the husky that runs at commit time probably doesn't work.
     We intend to update the dependencies to resolve this issue, but you may have started working on it before that update is synced to your repository.

• Node.js 16 has not been tested on CI

  This project has not yet been unit tested on Node.js 16.
  We cannot add untested versions to the support range (i.e. the value of the engines.node field).
  CI settings need to be updated to support Node.js 16.

The CI settings can be updated by us.
Modify it to automatically run unit tests based on the value of the engines.node field.
Modified by #184

However, the README.md file needs to be updated by you.
Because I don't know how to add a commit to this PR.

If I can find a way to add a commit to this PR I will update the README.md file.
But if there is no way to do that, this PR cannot be merged until you update README.md file.
Edited by 0b95ebd

[codeclimate]

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[sounisi5011]

• Successfully tested with Node.js v16
• The README.md file has been updated
• Updated CHANGELOG