Update CHANGELOG with const specifier fix
## [0.4.3-pre]
- Fix issue with initbuild.sh for custom builds (#43)
- Add casts to aid clean C++ builds (#47)
+- Add missing const specifier in generated `buffer_start` methods - removes C++
+ warnings (#48)
## [0.4.2]
- Fix SIGNIFICANT bug miscalculating the number of builder frames in
