fix stdout

Author: cijothomas

opentelemetry-stdout/src/logs/exporter.rs

@@ -57,7 +57,7 @@ impl opentelemetry_sdk::logs::LogExporter for LogExporter {
         }
     }
 
-    fn shutdown(&mut self) -> OTelSdkResult {
+    fn shutdown(&self) -> OTelSdkResult {
         self.is_shutdown.store(true, atomic::Ordering::SeqCst);
         Ok(())
     }