fixed usage information

src/main.rs

@@ -107,16 +107,17 @@ fn parse_toml(
 
 fn main() {
   let argv: Vec<String> = env::args().collect();
+  let usage_info = format!("Usage: {} [table.]key[[index]] [file...]", argv[0]);
 
   if argv.len() <= 1 {
-    eprintln!("Usage: {} [table...].[value[index]] [file...]", argv[0]);
+    eprintln!(, argv[0]);
     exit(64); // sysexits(3) EX_USAGE
   }
   
   let input = match argv.get(2) {
     Some(val) => val,
     None => {
-      eprintln!("Usage: {} [table...].[value[index]] [file...]", argv[0]);
+      eprintln!("{}", usage_info);
       exit(EX_USAGE);
     },
   };