Update README.md

Author: JingweiToo

README.md

@@ -85,7 +85,10 @@ sf_idx = FS.sf;
 Acc = jknn(feat(:,sf_idx),label,opts); 
 
 % Plot convergence
-plot(FS.c); grid on; xlabel('Number of Iterations'); ylabel('Fitness Value'); title('PSO');
+plot(FS.c); grid on;
+xlabel('Number of Iterations'); 
+ylabel('Fitness Value');
+title('PSO');
 ```
 
 ### Example 2 : Slime Mould Algorithm ( SMA )