lexer: introduce NewIsInRunes() shortcut for NewIsIn()

Signed-off-by: Alejandro Mery <amery@jpi.io>

lexer/runes.go

@@ -21,6 +21,12 @@ func NewIsIn(s string) func(rune) bool {
 	}
 }
 
+// NewIsInRunes generates a rune condition checker that accepts
+// the runes specified
+func NewIsInRunes(s ...rune) func(rune) bool {
+	return NewIsIn(string(s))
+}
+
 // NewIsOneOf generates a run condition checker that accepts runes
 // accepted by any of the given checkers
 func NewIsOneOf(s ...func(rune) bool) func(rune) bool {