cambios lectura 20 ingles

Signed-off-by: Patricia Fredes <pfredes@ubuntu.(none)>
cambios lectura 20 ingles

Signed-off-by: Patricia Fredes <pfredes@ubuntu.(none)>
Merge branch 'master' of github.com:joaofuentes/sql-course
cambios

Signed-off-by: Patricia Fredes <pfredes@ubuntu.(none)>