Update CHANGELOG with numeric parsing fix
- 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.
+- Fix incorrect infinity result in grisu3 parser and double to float
+ overflow handling in parse_float in portable library (affects JSON
+ of abnormal numeric values).
## [0.4.2]
- Fix SIGNIFICANT bug miscalculating the number of builder frames in
