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Fixes: #60
added mood implementation
Added implementation to support different moods
tests for mood
Added tests for natural and sad moods
fsay: added mood option
added a command line option to express ferris' mood
added happy mood
added another mood just for joy
This PR is part of me learning rust.
Thanks for having this small library for me to learn from.
If you like it I think documentation is needed as well,
to document my addition - which I wil happily provide