feat: added default for Bin so hashmap doesn't have to be specified

manifest/src/bin.rs

@@ -5,5 +5,15 @@ use serde::{Deserialize, Serialize};
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Bin {
     pub root: String,
+    #[serde(default)]
     pub checksums: HashMap<String, String>,
 }
+
+impl Default for Bin {
+    fn default() -> Self {
+        Bin {
+            root: String::default(),
+            checksums: HashMap::default(),
+        }
+    }
+}