YAML Command v0.1.0

Just released YAML Command v0.1.0. It is a command line tool for working
with YAML files.

As there doesn't seem to be any other "Shell-based API" for YAML, I thought
it might be a good idea to devise one.

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Appreciate any feedback.

(Note that the very first release of this project was called `yc`. The
project was renamed for clarity.)