Update release note with breaking changes for (.)

RELEASES.md

@@ -1,3 +1,24 @@
+Next version (planned as 1.4)
+=============================
+
+Breaking changes
+----------------
+
+* The curried dot operator added in Nickel 1.3 was implemented the wrong way:
+    the arguments were flipped, meaning that `(.) foo bar` was `bar."%{foo}"`
+    instead of the expected `foo."%{bar}"`. While the initial flipped
+    implementation seems more useful for piping operations using the reverse
+    application operator `|>`, it's inconsistent with all other curried
+    operators, where `(<operator>)` is always define as `fun x y => x <operator>
+    y`. To ensure consistency, and because the initial behavior was an overlook
+    and not a conscious design decision, we decided to change the definition of
+    `(.)` to match the other curried operator by flipping its arguments.
+
+    To fill the gap, we also introduced `std.record.get` with the same
+    definition as the `(.)` introduced in Nickel 1.3. To migrate, you can either
+    flip the arguments of the curried dot as a function `(.)` whenever possible,
+    or you can just replace it with the new `std.record.get`.
+
 Version 1.3
 ===========