Checked markdown, added diagnostics

README.md

 
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 ##Sesión de laboratorio:
 
 En la experiencia de laboratorio de hoy utilizarás la clase `Bird` para practicar la creación de objetos, acceder y cambiar sus atributos.
 
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 ##Laboratory session:
 
 In today's laboratory experience you will use the `Bird` class to practice the creation of objects, accessing and changing its attributes.