other: quick lint fixes for some warnings (#1367)

src/canvas/widgets/cpu_basic.rs

@@ -78,7 +78,7 @@ impl Painter {
 
                 // Very ugly way to sync the gauge limit across all gauges.
                 let hide_parts = columns
-                    .get(0)
+                    .first()
                     .map(|col| {
                         if col.width >= 12 {
                             LabelLimit::None

src/lib.rs

@@ -61,6 +61,7 @@ pub mod data_conversion;
 pub mod options;
 pub mod widgets;
 
+#[allow(unused_imports)]
 pub use utils::logging::*;
 
 #[cfg(target_family = "windows")]