Plot image to see how images are constructed

A2/histogram.py

@@ -113,6 +113,7 @@ class Histogram(object):
         """
         image = imageio.imread(uri=self.image_path)
         plt.imshow(image)
+        plt.show()
         grey_scale_image = color.rgb2gray(image)
 
         # convert greyscale to interval