Update CHANGELOG to remove JSON support entries

Removed support for JSON type options and dynamic JSON encoding in RowBinary.

Author: ruslandoga

CHANGELOG.md

@@ -3,8 +3,6 @@
 ## Unreleased
 
 - RowBinary: truncate NaiveDateTime resulting from DateTime64 https://github.com/plausible/ch/pull/297
-- Add support for `JSON(...)` (JSON with options) type https://github.com/plausible/ch/pull/309
-- RowBinary: de- and encode dynamic JSON https://github.com/plausible/ch/pull/296
 - use gregorian seconds for naive datetime encoding in RowBinary (it's faster this way) https://github.com/plausible/ch/pull/311
 - use `DateTime.to_unix/2` + `DateTime.to_naive/1` for naive datetime decoding in RowBinary https://github.com/plausible/ch/pull/313
 - allow non-UTC timezones for DateTime64 RowBinary encoding https://github.com/plausible/ch/pull/315