README.md in xgb-0.3.1 vs README.md in xgb-0.4.0

@@ -135,19 +135,25 @@
 
 ```ruby
 [[1, 2, 3], [4, 5, 6]]
 ```
 
-Or a Daru data frame
+Or a Numo NArray
 
 ```ruby
-Daru::DataFrame.from_csv("houses.csv")
+Numo::DFloat.new(3, 2).seq
 ```
 
-Or a Numo NArray
+Or a Rover data frame
 
 ```ruby
-Numo::DFloat.new(3, 2).seq
+Rover.read_csv("houses.csv")
+```
+
+Or a Daru data frame
+
+```ruby
+Daru::DataFrame.from_csv("houses.csv")
 ```
 
 ## Helpful Resources
 
 - [Parameters](https://xgboost.readthedocs.io/en/latest/parameter.html)