flag rename

src/main.rs

@@ -241,15 +241,15 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 .help("Generate random world"),
         )
         .arg(
-            Arg::with_name("gen-world")
-                .short("g")
-                .long("gen-world")
+            Arg::with_name("random")
+                .short("r")
+                .long("random")
                 .takes_value(false)
                 .help("Generate random world with 2 random robots"),
         )
         .get_matches();
     let mut robot_pool: Vec<robot::Robot> = Vec::new();
-    let world = match matches.is_present("gen-world") {
+    let world = match matches.is_present("random") {
         true => gen_world(&mut robot_pool),
         false => {
             let raw_conf = open_file(matches.value_of("file").unwrap_or("two_robots.txt"))?;