Update changelog (#7225)

Author: smillst

docs/CHANGELOG.md

@@ -1,11 +1,9 @@
-Version 3.49.6 (2025-08-??)
+Version 3.50.0 (2025-08-28)
 -----------------------------
 
-**User-visible changes:**
-
 **Implementation details:**
 
-**Closed issues:**
+Moved the Annotation File Utilities code into the Checker Framework repository as a subproject.
 
 
 Version 3.49.5 (June 30, 2025)

release.gradle

@@ -9,7 +9,7 @@ ext {
   //   * any new checkers have been added, or
   //   * backward-incompatible changes have been made to APIs or elsewhere.
   // To make a snapshot release, version should end in "-SNAPSHOT", then: ./gradlew publish
-  releaseVersion = '3.49.6'
+  releaseVersion = '3.50.0'
 
   releaseVersionRegex = "\\d\\.\\d+\\.\\d+(?:\\.\\d)?"