Updated CHANGELOG.md to include recent enhancements

- Integrated OAuth for secure Slack deployment notifications #194.
- Streamlined build and deployment process for faster CD and reduced
  resource use #246.
- Allow Sentry error reporting in CSP settings across environments #291.

CHANGELOG.md

@@ -28,7 +28,8 @@ changes.
 - Fixed vote calculation problems related to NoConfidence DRep [Issue 59](https://github.com/IntersectMBO/govtool/issues/59)
 - Fixed ada-holder/get-current-delegation error when delegated to NoConfidence or AlwaysAbstain dreps. [Issue 82](https://github.com/IntersectMBO/govtool/issues/82)
 - Fixed deployment scripts to address [Issue 171](https://github.com/IntersectMBO/govtool/issues/171).
-- Fixed get drep voting power incorrectly executed endpoint [Issue 280](https://github.com/IntersectMBO/govtool/issues/280)
+- Fixed get drep voting power incorrectly executed endpoint [Issue 280](https://github.com/IntersectMBO/govtool/issues/280).
+- Fixed CSP settings to allow error reports with Sentry [Issue 291](https://github.com/IntersectMBO/govtool/issues/291).
 
 ### Changed
 - `isRegistered` and `wasRegistered` fields in the drep/info endpoint changed to `isRegisteredAsDRep` and `wasRegisteredAsDRep` respectively [Issue 212](https://github.com/IntersectMBO/govtool/issues/212)
@@ -39,6 +40,8 @@ changes.
 - Renamed project from VVA to GovTool [Issue 97](https://github.com/IntersectMBO/govtool/issues/97).
 - (`docs/update-working-conventions`) Addressing [Issue 25](https://github.com/IntersectMBO/govtool/issues/25) changed working conventions documentation to improve intended flows.
 - Adjusted Nix configuration to meet projects needs [Issue 187](https://github.com/IntersectMBO/govtool/issues/187).
+- Integrated OAuth to securely notify about deployment status in Slack [Issue 194](https://github.com/IntersectMBO/govtool/issues/194).
+- Streamlined the application build and deployment process, thereby accelerating continuous delivery (CD) and reducing the resource burden [Issue 246](https://github.com/IntersectMBO/govtool/issues/246).
 
 ### Removed
 -