Todo Backend for SpringBoot2.2.0 and Java 12

This is an implementation for Todo Backend: https://www.todobackend.com/

It is an update from: https://github.com/jcsantosbr/todo-backend-spring4-java8

There is no tests in the repository. You can test the behavior running the service locally and running the specs directly here: https://www.todobackend.com/specs/index.html?http://localhost:8080/todos

The service is running at: https://todo-back-springboot220-java12.herokuapp.com/todos