v0.1.4: use stderr for error messages

src/main.rs

@@ -7,13 +7,13 @@ fn main() {
     let args: Vec<String> = env::args().collect();
 
     let conf = grep::Config::new(&args).unwrap_or_else(|err| {
-        println!("Problem parsing arguments: {}", err);
+        eprintln!("Problem parsing arguments: {}", err);
         process::exit(1);
     });
     //let filename = &conf.filename.clone();
 
     if let Err(e) = grep::run(conf) {
-        println!("Big bad bada boom!\n{:?}", e);
+        eprintln!("Big bad bada boom!\n{:?}", e);
         //println!("Big bad bada boom!\n{:?}", e.kind());
         //println!("Big bad bada boom!\n{}", e.description());