Bump serde-yaml to its latest version. (#72)

serde-yaml resolves dtolnay/serde-yaml#86 in
0.9.x. This patch bumps it to the latest version to clean up legacy
codes.

Cargo.toml

@@ -13,7 +13,7 @@ dirs = "4.0.*"
 tempfile = "3.8.*"
 # 1.0.98 doesn't compile under Mac
 serde = { version = "1.0.*", features = ["derive"] }
-serde_yaml = "0.8.*"
+serde_yaml = "0.9.34"
 toml_edit = "0.21.*"
 shellexpand = "2.1.*"
 log = "0.4.*"

src/config.rs

@@ -53,15 +53,10 @@ impl Default for Config {
 pub fn parse(path: PathBuf) -> Config {
     let file = std::fs::File::open(path).unwrap();
     let reader = std::io::BufReader::new(file);
-    let mut config = match serde_yaml::from_reader(reader) {
+    let mut config: Config = match serde_yaml::from_reader(reader) {
         Ok(c) => c,
         Err(e) => {
-            // Work around the empty yaml file issue.
-            // See https://github.com/dtolnay/serde-yaml/issues/86
-            if e.to_string() != "EOF while parsing a value" {
-                panic!("{}", e.to_string())
-            }
-            Config::default()
+            panic!("{}", e.to_string())
         }
     };
 
@@ -166,7 +161,6 @@ fonts:
         assert_eq!(config.term_config_path, Some("/path/to/config".to_string()));
     }
 
-
     #[test]
     fn test_parse_backend_and_deprecated_exe_path() {
         let config = parse(make_cfg_file("backend: alacritty\nexe_path: /path/to/alacritty").path);