docs(readme)

README.md

@@ -132,6 +132,7 @@ match-when supports [regular expressions](https://developer.mozilla.org/en-US/do
 - `{ x1: pattern1, ..., xn: patternn }` - matches any object with property names `x1` to `xn` matching patterns `pattern1` to `patternn`, respectively. Only the own properties of the pattern are used.
 - `[pattern0, ..., patternn]` - matches any object with property names 0 to n matching patterns `pattern0` to `patternn`, respectively.
 - `/pattern/flags` - matches any values than pass the regular expression test
+- `when.range(low, high)` matches any number value in the range [low, high], `low` and `high` included.
 - `when.or(pattern0, ..., patternn)` - matches if at [least one](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some) `pattern` matches.
 - `when.and(pattern0, ..., patternn)` - matches if [every](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every) `pattern` matches.