readme: fix typo for "-o" option

If you want to output to "standard input" -> "standard output"
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muxator 2023-11-15 11:13:30 +01:00 committed by GitHub
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@ -209,7 +209,7 @@ The following sub-commands are available.
* `-o`
* By default, the plot is output to **standard error output**.
* If you want to output to standard input, Use hyphen ` -o -` or no argument `uplot s -o | `.
* If you want to output to standard output, Use hyphen ` -o -` or no argument `uplot s -o | `.
### Output the input data