RELEASE_NOTES.md in procrastinator-1.2.0 vs RELEASE_NOTES.md in procrastinator-2.0.0

@@ -1,7 +1,21 @@
 # Release Notes
 
-## 1.2.0 (         )
+## 2.0.0 (2023-06-17)
+
+### Major Changes
+
+* Updated minimum ruby to 3.0
+
+### Minor Changes
+
+* Updated development dependencies
+
+### Bugfixes
+
+* none
+
+## 1.2.0 (2023-06-17)
 
 ### Major Changes
 
 * none