chore: Removing --save from npm install command

[Topener]

Proposed changes

As per NPM documentation, the --save flag is not mandatory and actually the default behaviour. This has been the case for several years already, and at this point save to assume everyone has a version more modern than the one that required it.

Types of changes

• Bugfix
• New feature
• Breaking change
  
• Chore
  

Checklist

• I have read the CONTRIBUTING.md doc
• My PR is named according to CONTRIBUTING.md doc
• End-to-end tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Further comments

No comments.