fix(config): use custom error type for UTF-8 errors

git-cliff-core/src/embed.rs

@@ -21,7 +21,7 @@ impl EmbeddedConfig {
 	/// Extracts the embedded content.
 	pub fn get_config() -> Result<String> {
 		match Self::get(crate::DEFAULT_CONFIG) {
-			Some(v) => Ok(str::from_utf8(&v.data.into_owned()).unwrap().to_string()),
+			Some(v) => Ok(str::from_utf8(&v.data.into_owned())?.to_string()),
 			None => Err(Error::EmbeddedError(String::from(
 				"Embedded config not found",
 			))),

git-cliff-core/src/error.rs

@@ -6,6 +6,10 @@ pub enum Error {
 	/// Error that may occur while I/O operations.
 	#[error("IO error: `{0}`")]
 	IoError(#[from] std::io::Error),
+	/// Error that may occur when attempting to interpret a sequence of u8 as a
+	/// string.
+	#[error("UTF-8 error: `{0}`")]
+	Utf8Error(#[from] std::str::Utf8Error),
 	/// Error variant that represents errors coming out of libgit2.
 	#[error("Git error: `{0}`")]
 	GitError(#[from] git2::Error),