README: specifically mention that /s is specific to this plugin

[skip ci]

From: 5e6c9349fa
This commit is contained in:
James Lu 2018-05-19 12:54:21 -07:00
parent e831d0e8ec
commit 363285cfbf

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@ -22,4 +22,4 @@ The following regex flags (i.e. the `g` in `s/abc/def/g`, etc.) are supported:
- `i`: case insensitive replacement
- `g`: replace all occurences of the original text
- `s`: replace only messages from the caller
- `s`: *(custom flag specific to this plugin)* replace only messages from the caller