Remove testing for Ruby 2.5

.github/workflows/continuous-integration.yml

@@ -6,13 +6,9 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: ["2.5", "2.6", "2.7"]
+        ruby: ["2.6", "2.7"]
         db: [sqlite, mysql, postgres]
         exclude:
-          - ruby: "2.5"
-            db: sqlite
-          - ruby: "2.5"
-            db: postgres
           - ruby: "2.6"
             db: sqlite
           - ruby: "2.6"

doc/CHANGELOG.md

@@ -1,5 +1,11 @@
 See doc/upgrading.md for the upgrade documentation!
 
+## Version 2.6
+
+## Removed features
+
+* No longer supporting EOL Ruby 2.5
+
 ## Version 2.5.2
 
 ### New features