Impl clone for colors (#79)

* add Clone/Copy derives

* update changelog

Author: mfreeborn

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [0.8.0] - 2022-xx-xx
 ### Added
 - impl `Clone`, `Serialize` and `PartialEq` for `Plot`
+- impl `Clone` +/- `Copy` for color types
 - Support for [configuration options](https://plotly.com/javascript/configuration-options/)
 - Support for layout templates and pre-defined themes
 - Support for WASM environments

plotly/src/common/color.rs

@@ -25,7 +25,7 @@ pub trait Color {
     fn to_color(&self) -> ColorWrapper;
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone, Copy)]
 pub struct Rgb {
     r: u8,
     g: u8,
@@ -44,7 +44,7 @@ impl Color for Rgb {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone, Copy)]
 pub struct Rgba {
     r: u8,
     g: u8,
@@ -68,7 +68,7 @@ impl Color for Rgba {
 }
 
 // https://www.w3.org/TR/css-color-3/#svg-color
-#[derive(Debug)]
+#[derive(Debug, Clone, Copy)]
 pub enum NamedColor {
     AliceBlue,
     AntiqueWhite,