Parse hex colors in themes (#647)

Just delegate to the default deserializer of crossterm which learned
dealing with hex color in version 0.27.0.

Cargo.toml

@@ -21,7 +21,7 @@ clap_complete = "4.1"
 version_check = "0.9.*"
 
 [dependencies]
-crossterm = { version = "0.24.0", features = ["serde"] }
+crossterm = { version = "0.27.0", features = ["serde"] }
 dirs = "3.0.*"
 libc = "0.2.*"
 human-sort = "0.2.2"

src/theme/color.rs

@@ -1,7 +1,7 @@
 ///! This module provides methods to create theme from files and operations related to
 ///! this.
 use crossterm::style::Color;
-use serde::Deserialize;
+use serde::{de::IntoDeserializer, Deserialize};
 use std::fmt;
 
 // Custom color deserialize
@@ -23,8 +23,7 @@ where
         where
             E: serde::de::Error,
         {
-            Color::try_from(value)
-                .map_err(|_| E::invalid_value(serde::de::Unexpected::Str(value), &self))
+            Color::deserialize(value.into_deserializer())
         }
 
         fn visit_u64<E>(self, value: u64) -> Result<Color, E>