use derived default

src/cache.rs

@@ -20,17 +20,15 @@ const CACHE_TYPE_TRANSACTIONS: &str = "transactions";
 /// None    : Caching is disabled
 /// Memory  : Caching is provided in-memory and not persisted across runs
 /// Disk    : Caching is persisted on disk in the provided directory and can be reset
-#[derive(Debug, Clone)]
+#[derive(Default, Debug, Clone)]
 pub enum CacheConfig {
+    #[default]
     None,
     Memory,
-    Disk { dir: String, reset: bool },
-}
-
-impl std::default::Default for CacheConfig {
-    fn default() -> Self {
-        CacheConfig::None
-    }
+    Disk {
+        dir: String,
+        reset: bool,
+    },
 }
 
 /// A general purpose cache.