Filter no log messages by default

src/lib.rs

@@ -35,7 +35,7 @@ impl SimpleLogger {
     #[must_use = "You must call init() to begin logging"]
     pub fn new() -> SimpleLogger {
         SimpleLogger {
-            default_level: LevelFilter::Trace,
+            default_level: LevelFilter::Off,
             module_levels: Vec::new(),
         }
     }