Update README.md

JavaProgrammerLB · web-flow · commit 87ab983374b7 · 2018-01-11T12:30:34.000+08:00
diff --git a/README.md b/README.md
@@ -3,7 +3,7 @@ Solve Problems in http://www.pythonchallenge.com
 
 #### 27 
 result: http://www.pythonchallenge.com/pc/ring/bell.html auth=(repeat, switch)
-- author use python2 keyword, but there is some different with python3
+- author use python2 keyword, which has some different with python3
 - use assert to do assert
 - tobytes() method for Image in PIL: Return image as a bytes object.
 - getpalette() method for Image in PIL:  Returns the image palette as a list.
