Added subtitle on yaxis position

Author: audunth

README.md

@@ -53,10 +53,13 @@ plt.show()
 ```
 ![multifig](./assets/multifig.png)
 
+#### Position of the y-axis
+
 By default, the x-coordinates of the y-axis labels are aligned with the subfigure labels, but the y-axis label position can be adjusted using
 ```python
 ax[i].yaxis.set_label_coords(x_coordinate, y_coordinate)
 ```
+
 ## `change_log_axis_base`
 
 ```python