Update README.md

Author: Deepak Malik

README.md

@@ -154,6 +154,7 @@ Below topics/problems are covered as of now.
 - [ ] NumberUtils
 - [X] [ArrayUtils](../master/src/com/deepak/data/structures/Utils/ArrayUtils.java)
 - [ ] ListUtils
+- [ ] BooleanUtils
 - [ ] CollectionUtils
 - [ ] MapUtils
 - [ ] DateUtils