Correct ChangeLog details

Author: Mark Delany

ChangeLog.md

@@ -1,11 +1,3 @@
 # netstring Change Log
-### v1.0.0 -- 2023-05-10
-  * Initial public release.
-### v2.0.0 -- 2023-05-16
-  * Refactor to more closely match encoder/json
-  * Remove notifier and concurrency controls
-  * NewDecoder now accepts an io.Reader
-  * Decoder now returns io.EOF at end of stream
-  * Lay groundwork for introduction of Marshal and Unmarshal
-### v2.1.0 -- 2023-05-16
-  * Add Encoder.Marshal() and Decoder.Marshal()
+### v1.0.0 -- 2023-05-17
+  * Initial public re-release.