Update README.md

updated instructions.

subjects/rotatevowels/README.md

@@ -4,8 +4,8 @@
 
 Write a **program** that checks the arguments for vowels.
 
-- If the argument contains vowels (for this exercise `y` is not considered a vowel) the program has to **"mirror"** the position of the vowels in the argument (see the examples).
-- If the number of arguments is less than 1, the program display a new line ("`\n`").
+- If the arguments contains vowels (for this exercise `y` is not considered a vowel) the program has to **"mirror"** the position of the vowels in the arguments (see the examples).
+- If the number of arguments is less than 1, the program displays a new line ("`\n`").
 - If the arguments do not have any vowels, the program just prints the arguments.
 
 Example of output :