Merge pull request #896 from gwenn/clippy

Fix clippy warning

Author: gwenn

src/config.rs

@@ -149,7 +149,7 @@ impl Config {
 
     /// Tell if colors should be enabled.
     ///
-    /// By default, they are except if stdout is not a TTY or NO_COLOR
+    /// By default, they are except if stdout is not a TTY or `NO_COLOR`
     /// environment variable is set.
     #[must_use]
     pub fn color_mode(&self) -> ColorMode {