resistor-color: Use int-enum 0.5.0, up from 0.4.0

Fixes compatibility with rust-analyzer
rust-lang/rust-analyzer#13347
Juici/int-enum-rs#4

Author: sergey-tihon

Diff for: exercises/concept/resistor-color/.docs/instructions.md

@@ -31,7 +31,7 @@ The goal of this exercise is to create a way:
 - to convert the numerical value into a string representing color
 - to list the different band colors
 
-For task number one, you will need the external crate [`int-enum`](https://docs.rs/int-enum/0.4.0/int_enum/) and for task number three, you'll need [`enum-iterator`](https://docs.rs/enum-iterator/1.1.1/enum_iterator/).
+For task number one, you will need the external crate [`int-enum`](https://docs.rs/int-enum/0.5.0/int_enum/) and for task number three, you'll need [`enum-iterator`](https://docs.rs/enum-iterator/1.1.1/enum_iterator/).
 They're both already included in this exercise's `Cargo.toml`.
 Be sure to check the crates' documentation to learn how to use them.
 You can look into the default implementation of the Debug trait for Enums to complete task number two.

Diff for: exercises/concept/resistor-color/.docs/introduction.md

@@ -6,4 +6,4 @@ You will often see external packages being referred to as "crates" in Rust. A cr
 
 Most of the time, adding an external dependency is as simple as adding a line to your `Cargo.toml` file.
 
-In this exercise, [`enum-iterator`](https://docs.rs/enum-iterator/1.1.1/enum_iterator/) and [`int-enum`](https://docs.rs/int-enum/0.4.0/int_enum/) dependencies were added for you.
+In this exercise, [`enum-iterator`](https://docs.rs/enum-iterator/1.1.1/enum_iterator/) and [`int-enum`](https://docs.rs/int-enum/0.5.0/int_enum/) dependencies were added for you.

Diff for: exercises/concept/resistor-color/Cargo.toml

@@ -4,5 +4,5 @@ name = "resistor-color"
 version = "1.0.0"
 
 [dependencies]
-int-enum = "0.4.0"
+int-enum = "0.5.0"
 enum-iterator = "1.1.1"