minor edits; reword messages

src/main.rs

@@ -15,7 +15,7 @@ fn main() -> anyhow::Result<()> {
 
     let config : input::Config = {
         let config = fs::read_to_string(&args.config)
-            .with_context(|| "failed to read in podcast configuration file")?;
+            .context("failed to read in podcast configuration file")?;
 
         toml::from_str(&config[..])?
     };