Update README.md

swsoyee · web-flow · commit cd4d3d4866ad · 2018-03-24T21:43:13.000+09:00
diff --git a/README.md b/README.md
@@ -18,3 +18,4 @@ My solutions of [PRACTICE PYTHON](http://www.practicepython.org/)
 [15. Reverse Word Order](http://www.practicepython.org/solution/2014/05/28/15-reverse-word-order-solutions.html)  
 [16. Password Generator](http://www.practicepython.org/solution/2014/06/06/16-password-generator-solutions.html)  
 
+[18. Cows And Bulls](http://www.practicepython.org/exercise/2014/07/05/18-cows-and-bulls.html)  

Original file line number	Diff line number	Diff line change
`@@ -18,3 +18,4 @@ My solutions of [PRACTICE PYTHON](http://www.practicepython.org/)`
`18`	`18`	`[15. Reverse Word Order](http://www.practicepython.org/solution/2014/05/28/15-reverse-word-order-solutions.html)`
`19`	`19`	`[16. Password Generator](http://www.practicepython.org/solution/2014/06/06/16-password-generator-solutions.html)`
`20`	`20`
	`21`	`+[18. Cows And Bulls](http://www.practicepython.org/exercise/2014/07/05/18-cows-and-bulls.html)`