Update CHANGELOG with duplicate field check fix
- Add `FLATCC_TRACE_VERIFY` as build option.
- Allow more costumization of allocation functions (#55).
- Avoid dependency on PORTABLE_H include guard which is too common (#55).
+- (possibly breaking) Fix duplicate field check in flatcc_builder_table_add call.
## [0.4.2]
- Fix SIGNIFICANT bug miscalculating the number of builder frames in
