README mentions --save, but no such option exists

[jaraco]

In the README, for the set command, it mentions a --save/-s option, but that option is not yet implemented. It should be removed from the readme until it is implemented in order to save people time trying to use a feature that's not present.

[trans]

I'll take a look. Sorry if that inconvenienced you. This project has been on hold b/c I've want to port it to a compiled language before doing any additional work on it. Unfortunately YAML support seems to be rather immature and/or very difficult to use in so many languages (Go, Rust, Crystal, Julia, etc.) Eventually though... eventually.