fix(go-exam): add missing import piscine, style: correct white-spaces and formatting

subjects/fromto/README.md

@@ -1,13 +1,13 @@
-# fromto
+## fromto
 
 ### Instructions
 
 - Write a function that takes two `integers` and returns a `string` representing the range of numbers from the first to the second.
 - The function can return the numbers in any order.
 - The number must be separated by a comma and a space.
-- If any of the arguments is bigger than 99 or less than 0, the function returns `"invalid"` followed by a newline (`'\n'`).
+- If any of the arguments is bigger than 99 or less than 0, the function returns `"Invalid"` followed by a newline (`'\n'`).
 - Add `0` at the first of any number if it is less than 10.
-- Add a new line (`'\n'`) at the end of the string.
+- Add a new line (`'\n'`) at the end of the `string`.
 
 ### Expected function
 ```go
@@ -23,13 +23,16 @@ Here is a possible program to test your function:
 ```go
 package main
 
-import "fmt"
+import (
+        "fmt"
+        "piscine"
+)
 
 func main() {
-  fmt.Print(FromTo(1, 10))
-  fmt.Print(FromTo(10, 1))
-  fmt.Print(FromTo(10, 10))
-  fmt.Print(FromTo(100, 10))
+        fmt.Print(piscine.FromTo(1, 10))
+        fmt.Print(piscine.FromTo(10, 1))
+        fmt.Print(piscine.FromTo(10, 10))
+        fmt.Print(piscine.FromTo(100, 10))
 }
 ```
 And its output:
@@ -39,5 +42,5 @@ $ go run . | cat -e
 01, 02, 03, 04, 05, 06, 07, 08, 09, 10$
 10, 09, 08, 07, 06, 05, 04, 03, 02, 01$
 10$
-invalid$
+Invalid$
 ```