fixed small typo in README.md #9
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$ broadlink-listener discover_ir
Usage: broadlink-listener [OPTIONS] COMMAND [ARGS]...
Try 'broadlink-listener --help' for help.
Error: No such command 'discover_ir'. Did you mean 'discover-ir'?
$ broadlink-listener discover-ir
Broadlink listener - v1.2.0
not a big PR but I thought it helps :)