Flush config file to avoid losing data

For some reason not flushing the config file will sometime cause the
write to not complete resulting in an empty config file. This behaviour
seems like a bug, possible in async-std, and should be investigated
furtherer.

Author: Ben Aaron Goldberg

src/main.rs

@@ -43,6 +43,7 @@ async fn init_file_if_not_exists(
 
         if let Some(text) = text {
             file.write_all(text).await?;
+            file.flush().await?;
         }
     }
     Ok(())