Rubocop auto-correct all

`rubocop -A`

https://docs.rubocop.org/rubocop/usage/auto_correct.html

Author: JPrevost

test/controllers/auth_controller_test.rb

@@ -3,7 +3,7 @@
 class AuthControllerTest < ActionDispatch::IntegrationTest
   test 'valid credentials returns JWT' do
     u = users(:yo)
-    b = Base64.encode64(u.email + ':123greetings')
+    b = Base64.encode64("#{u.email}:123greetings")
     get '/api/v1/auth', headers: { Authorization: "Basic #{b}" }
     assert_equal(200, response.status)
     assert_equal(u.id, JwtWrapper.decode(JSON.parse(response.body))['user_id'])