Update README.md

Publication II/README.md

@@ -11,6 +11,6 @@ L. Prieto Santamaría*, E. Ugarte Carro*, M. Díaz Uzquiano, E. Menasalvas Ruiz,
 :point_right: Go to [supplementary information](https://medal.ctb.upm.es/internal/gitlab/lprieto/phd-thesis-luciaprietosantamaria/blob/master/Publication%20II/SM%20-%20Publication%20II.pdf)
 
 
-The broad methodology used in this publications is summarized in the following figure:
+The broad methodology used in this publication is summarized in the following figure:
 
 <img src="./Pub II methodology.png">
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