Add @oclif/plugin-warn-if-update-available
#156
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Summary
This will allow users to be alerted when a new version of the CLI is released. The CLI will poll the registry a maximum of once every 7 days when the user runs a command. If the user is running an outdated version, a warning will be printed to STDERR. It should be noted that this warning will be printed even if --json is passed so users should make sure to only read from STDOUT if they are fetching the data (this should be the default for any ordinary use case).
Type
Usage
Screenshots
Self Review
npm run test
and it generates no new errors or warnings