update changelog

Author: joshstevens19

documentation/docs/pages/docs/changelog.mdx

@@ -9,6 +9,7 @@
 - feat: expose new ethereum sql type wrappers for bytes types#
 - feat: expose postgres ToSql trait
 - feat: support with_transaction in postgres client
+- feat: get the block timestamp from the RPC call (its an option as not all providers expose it)
 
 ### Bug fixes
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