Exclude migration file from Metrics/AbcSize check

.rubocop.yml

@@ -11,6 +11,12 @@ AllCops:
   Exclude:
     - test/dummy/db/schema.rb
 
+# Migrations often contain long up/down methods, and extracting smaller methods
+# from these is of questionable value.
+Metrics/AbcSize:
+  Exclude:
+    - 'test/dummy/db/migrate/*'
+
 Metrics/ClassLength:
   Exclude:
     - test/**/*

.rubocop_todo.yml

@@ -3,8 +3,6 @@
 
 # Offense count: 19
 Metrics/AbcSize:
-  Exclude:
-    - 'test/dummy/db/migrate/20110208155312_set_up_test_tables.rb'
   Max: 46 # Goal: 15
 
 # Offense count: 6