Update readme

Signed-off-by: Jack Cherng <[email protected]>

Author: jfcherng

README.md

@@ -344,9 +344,11 @@ $result = $diff->render($renderer);
 - Names involving `a, b`, `from, to`, `base, changed` have been renamed to `old, new` for consistency.
   Here's some examples:
 
+  - `Diff::setAB()` becomes `Diff::setOldNew()`.
   - `Diff::setA()` becomes `Diff::setOld()`.
   - `Diff::setB()` becomes `Diff::setNew()`.
-  - `Diff::setAB()` becomes `Diff::setOldNew()`.
+  - `Diff::getA()` becomes `Diff::getOld()`.
+  - `Diff::getB()` becomes `Diff::getNew()`.
   - `base`, `changed` keys in the result of the `Json` renderer have become `old`, `new`.
 
 - In the result of HTML renderers, classes of rows of line numbers has been changed.