Update README.md

Author: khvilaboa

epidemic_sirs/README.md

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-# Susceptible-Infected-Recovered Disease Spread Model
+# Susceptible-Infected-Recovered-Susceptible Disease Spread Model
 
-Bidimensional grid adaptation of the Geo-Entity Cellular Automata presented by [Zhong et al.](https://link.springer.com/article/10.1007/s11430-009-0044-9).
+Bidimensional Cell-DEVS adaptation of the Geo-Entity Cellular Automata presented by [Zhong et al.](https://link.springer.com/article/10.1007/s11430-009-0044-9).
 However, rules have been re-interpreted by [Kevin Henares](mailto:[email protected]).