Update README.md

Updated small typo in read me

Author: fabriciocravo

README.md

@@ -88,8 +88,8 @@ Standard parameters can also be configured using a JSON file with the `.set_from
 	MySim.plot_data = False
 	MySim.duration = 100
 	MySim.repetitions = 10
-	MySim.plot.xlim = [0,1]
-	MySim.plot.ylim = [0, 1e3]
+	MySim.plot_config.xlim = [0,1]
+	MySim.plot_config.ylim = [0, 1e3]
 
 For a list of parameters, check the read_me in the parameter directory. The standard parameters can be found in the `get_default_parameters()` script in the `default_reader()` script.