update changelog

wada314 · Jan 4, 2022 · 0ae156e · 0ae156e
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+# v 0.4.0
+- So many changes.
+- The message struct does not have public fields anymore. Use the methods instead.
+- Added getter and setter methods for the normal message structs and the bumpalo structs.
+- Changed the internal implementation of the normal message struct and bumpalo struct.
+These uses a `bitvec` to manage `optional` fields' presence bit.
+
 # v 0.3.1
 - Fixed that the compile does not pass in the latest rustc nightly (1.58).