Add dp-cli version to git commit on project generation

[jessjenkins]

When generating a new project, update the generated git commit message to include the version of the dp-cli tool that was used to generate the code.

This means that git blame on the generated files details its history accurately.

See https://github.com/ONSdigital/dp-cli/blob/master/repository_creation/edit_repository.go#L83