update readme: add blog post

Author: laixintao

README.md

@@ -2,5 +2,8 @@
 The python implementation to make superpixels by slic.
 
 see:
-SLIC Superpixels Compared to State-of-the-art Superpixel Methods
+
+1. SLIC Superpixels Compared to State-of-the-art Superpixel Methods
   by Radhakrishna Achanta, Appu Shaji, Kevin Smith, Aurelien Lucchi, Pascal Fua, and Sabine Su ̈sstrunk
+
+2. My post: [SLIC算法分割超像素原理及Python实现](https://www.kawabangga.com/posts/1923)