Update changelog.mdx

Author: joshstevens19

documentation/docs/pages/docs/changelog.mdx

@@ -33,6 +33,10 @@ github branch - https://github.com/joshstevens19/rindexer/tree/release/0.25.3
 - fix: regenerated example projects to support latest changes
 - fix: Index creation fails for filter contracts due to schema name mismatch
 
+### Breaking changes
+-------------------------------------------------
+- `contract_address` Postgres column changed from `char(66)` to `char(42)`
+- `PostgresClient` now only exposes `insert_bulk` which handles internally whether to insert rows via INSERT or COPY
 
 # 0.25.2-beta - 30th August 2025