Lower MSRV

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "imagequant"
-version = "4.3.2"
+version = "4.3.3"
 description = "Convert 24/32-bit images to 8-bit palette with alpha channel.\nFor lossy PNG compression and high-quality GIF images\nDual-licensed like pngquant. See https://pngquant.org for details."
 authors = ["Kornel Lesiński <kornel@pngquant.org>"]
 license = "GPL-3.0-or-later"
@@ -38,7 +38,7 @@ thread_local = { version = "1.1.8", optional = true }
 once_cell = "1.19.0"
 
 [dev-dependencies]
-lodepng = "3.10.4"
+lodepng = "3.10"
 
 [workspace]
 members = ["imagequant-sys", "imagequant-sys/c_test"]

src/kmeans.rs

@@ -133,7 +133,7 @@ fn replace_unused_colors(palette: &mut PalF, hist: &HistogramInternal) -> Result
             let colors = palette.as_slice();
             // the search is just for diff, ignoring adjusted_weight,
             // because the palette already optimizes for the max weight, so it'd likely find another redundant entry.
-            for item in &hist.items {
+            for item in hist.items.iter() {
                 // the early reject avoids running full palette search for every entry
                 let may_be_worst = colors.get(item.likely_palette_index() as usize)
                     .map_or(true, |pal| pal.diff(&item.color) > worst_diff);

src/quant.rs

@@ -441,7 +441,7 @@ fn refine_palette(palette: &mut PalF, attr: &Attributes, hist: &mut HistogramInt
 #[cold]
 fn palette_from_histogram(hist: &HistogramInternal, max_colors: PalLen) -> (PalF, Option<f64>) {
     let mut hist_pal = PalF::new();
-    for item in &hist.items {
+    for item in hist.items.iter() {
         hist_pal.push(item.color, PalPop::new(item.perceptual_weight));
     }