chore: update changelogs

Author: achilleas-kal

README.md

@@ -78,6 +78,10 @@ Note that the [sync client](https://github.com/InjectiveLabs/sdk-python/blob/mas
 
 
 ### Changelogs
+**0.5.7.8**
+* Add state as a request param in OrdersHistory
+* Add market_id as an optional param in Positions
+
 **0.5.7.7**
 * Add start_time and end_time in TradesRequest