update

src/configuration.rs

@@ -168,7 +168,7 @@ impl fmt::Display for Configuration {
             "  - Enable multiple session: {}",
             self.enable_multiple_session
         )?;
-        writeln!(f, "  - Session environment variable:")?;
+        writeln!(f, "  - Session environment variables:")?;
         for (k, v) in &self.session_envars {
             writeln!(f, "    + {} = '{}'", k, v)?;
         }