Cleanup bytecode generator (pegjs/pegjs#450): Update CHANGELOG.md

CHANGELOG.md

@@ -31,6 +31,17 @@ Released: TBD
   from the `options.grammarSource` property. That property can contain arbitrary
   data,for example, path to the currently parsed file.
   [@Mingun](https://github.com/peggyjs/peggy/pull/95)
+- The code generator was slightly reworked to simplify reusing the bytecode generator
+  (`generate.generateBytecode` pass). Property `consts` on the `grammar` AST node,
+  has been creating by the pass in the past, was decoupled into 4 other properties
+  with the structured information:
+  - `literals`
+  - `classes`
+  - `expectations`
+  - `functions`
+
+  Now bytecode generation pass is independent from the JavaScript backend.
+  [@Mingun](https://github.com/peggyjs/peggy/pull/117)
 
 ### Bug fixes