Remove deprecated method `supports_migrations?`

activerecord/CHANGELOG.md

+*   Remove deprecated method `supports_migrations?`.
+
+    *Rafael Mendonça França*
+
 *   Remove deprecated methods `initialize_schema_migrations_table` and `initialize_internal_metadata_table`.
 
     *Rafael Mendonça França*

activerecord/lib/active_record/connection_adapters/abstract_adapter.rb

@@ -196,11 +196,6 @@ def adapter_name
         self.class::ADAPTER_NAME
       end
 
-      def supports_migrations? # :nodoc:
-        true
-      end
-      deprecate :supports_migrations?
-
       def supports_primary_key? # :nodoc:
         true
       end

activerecord/test/cases/migration_test.rb

@@ -1107,10 +1107,6 @@ def test_unknown_migration_version_should_raise_an_argument_error
     assert_raise(ArgumentError) { ActiveRecord::Migration[1.0] }
   end
 
-  def test_deprecate_supports_migrations
-    assert_deprecated { ActiveRecord::Base.connection.supports_migrations? }
-  end
-
   def test_deprecate_schema_migrations_table_name
     assert_deprecated { ActiveRecord::Migrator.schema_migrations_table_name }
   end