Update README.md

Fixed version dates

Author: freynes

README.md

@@ -61,14 +61,13 @@ df = gmd(version="2025_01", country=["USA", "CHN"], variables=["rGDP", "unemp",
 - **show_preview (bool)**: If True and no other parameters are provided, shows a preview.
 
 ## Release schedule 
-
-| Release Date | Details          |
-|--------------|------------------|
-| 2025-01-30   | Initial release: v2025-01 |
-| 2025-04-01   | v2025-04         |
-| 2025-07-01   | v2025-09         |
-| 2025-10-01   | v2025-12         |
-| 2026-01-01   | v2026-03         |
+| Release Date | Details         |
+|--------------|-----------------|
+| 2025-01-30   | Initial release: 2025_01 |
+| 2025-04-01   | 2025_03         |
+| 2025-07-01   | 2025_06         |
+| 2025-10-01   | 2025_09         |
+| 2026-01-01   | 2025_12         |
 
 ## Citation
 
@@ -85,4 +84,4 @@ To cite this dataset, please use the following reference:
 
 ## Acknowledgments
 
-The development of the Global Macro Database would not have been possible without the generous funding provided by the Singapore Ministry of Education (MOE) through the PYP grants (WBS A-0003319-01-00 and A-0003319-02-00), a Tier 1 grant (A-8001749- 00-00), and the NUS Risk Management Institute (A-8002360-00-00). This financial support laid the foundation for the successful completion of this extensive project.
+The development of the Global Macro Database would not have been possible without the generous funding provided by the Singapore Ministry of Education (MOE) through the PYP grants (WBS A-0003319-01-00 and A-0003319-02-00), a Tier 1 grant (A-8001749- 00-00), and the NUS Risk Management Institute (A-8002360-00-00). This financial support laid the foundation for the successful completion of this extensive project.