Add version check option

[kazuhitoyokoi]

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

I added version check option for node generator command line.
It will be useful to report version when users report some problem about node generator.

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the mailing list/slack team.
• I have run grunt to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality

[coveralls]

Coverage remained the same at 77.607% when pulling e7416fb on kazuhitoyokoi:master-addversioncheck into d174103 on node-red:master.