Alphabetize changelog entries

Because I’m nitpicky like that. :D

Author: AkenRoberts

CHANGELOG.md

@@ -28,6 +28,10 @@ a release.
 #### Fixed
 - Added missing string casting of `objectId` in `LogEntryRepository::revert()` method (#2009)
 
+### ReferenceIntegrity
+#### Fixed
+- Get class from meta in ReferenceIntegrityListener [#2021]
+
 ### Translatable
 #### Fixed
 - Return default AST executor instead of throwing Exception in Walker (#2018)
@@ -36,10 +40,6 @@ a release.
 #### Fixed
 - Remove hard-coded parent column name in repository prev/next sibling queries [#2020]
 
-### ReferenceIntegrity
-#### Fixed
-- Get class from meta in ReferenceIntegrityListener [#2021]
-
 ## [2.4.37] - 2019-03-17
 ### Translatable
 #### Fixed