fix: accept at least one argument (#11)

We should accept at least one argument since we made the second argument optional in #9

Reviewed-on: https://codeberg.org/vlw/curl/pulls/11

curl.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Check if the correct number of arguments is provided
-if [ "$#" -ne 1 ]; then
+if [ -z "${1:-}" ]; then
     echo "Usage: $0 <url> [request_method]"
     exit 1
 fi