clean up some rubocop stuff

test/integration/variable_test.rb

@@ -70,9 +70,9 @@ class VariableTest < Minitest::Test
     assigns['test'] = 'Tobi'
     assert_equal 'Hello Tobi', template.render!(assigns)
     assigns.delete('test')
-    e = assert_raises(RuntimeError) {
+    e = assert_raises(RuntimeError) do
       template.render!(assigns)
-    }
+    end
     assert_equal "Unknown variable 'test'", e.message
   end