Update HISTORY.md

Update history to preserve the change description.

HISTORY.md

@@ -44,6 +44,7 @@ Language changes
   a function like other operators. The dotted version `.-->` is now parsed as well.
   For backwards compatibility, `-->` still parses using its own expression head
   instead of `:call`.
+* The middle dot `·` (`\cdotp` U+00b7) and the Greek interpunct `·` (U+0387) are now treated as equivalent to the dot operator `⋅` (`\cdot` U+22c5) (#25157).
 * The `a[begin, k]` syntax now calls `firstindex(a, 1)` rather than `first(axes(a, 1))` ([#35779]),
   but the former now defaults to the latter for any `a` ([#38742]).
 * `⌿` (U+233F) and `¦` (U+00A6) are now infix operators with times-like and plus-like precedence,