remove `piscine` header and fix typo

subjects/printrange/README.md

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+## print-range 
+
+### Instructions
+
+Write a function called `PrintRange` that given a range between two numbers, prints all numbers in that range.
+
+- If the starting number is greater than the ending number, print the numbers in descending order, otherwise in ascending order.
+- If the number is greater than `9` print only up to `9`
+- If the number is less than '0' print only up to '0'
+- If both numbers are less than `0` print (`'\n'`), the same applies when both numbers are greater than 9.
+- The output must be separated by spaces and (`'\n'`) at the end.
+
+### Expected function
+
+```go
+func PrintRange(start, end int) {
+    // Your code here
+}
+```
+
+### Usage
+
+Here is a possible program to test your function:
+
+```go
+package main
+
+import "fmt"
+
+func main() {
+    PrintRange(1, 10)
+    PrintRange(10, 1)
+    PrintRange(1, 1)
+    PrintRange(10, 10)
+    PrintRange(0, 9)
+    PrintRange(-1, -10)
+}
+```
+
+and the output should be:
+
+```console
+$ go run . | cat -e
+1 2 3 4 5 6 7 8 9$
+9 8 7 6 5 4 3 2 1$
+1$
+$
+0 1 2 3 4 5 6 7 8 9$
+$
+```