Mise à jour de 'README.md'

README.md

@@ -4,7 +4,7 @@ This package is provided as a companion to the paper
 
 ___Transport policies in polycentric cities, by
   Q. David and M. Kilani, Transportation Research Part A: Policy
-  and Practive, 2022.___
+  and Practice, 2022.___
 
 The package is composed of two executables :