Update README.md

Author: tommygonzaleza

exercises/07.1-square-value/README.md

@@ -2,8 +2,8 @@
 
 ## 📝 Instructions
 
-1. Write a method called `square` which can calculate square value of number.
+1. Write a function called `square` which can calculate square value of number.
 
 ## 💡 Hint:
 
-+ Using the ** operator
++ Using the ** operator