Move constant to top of impl block

src/metadata/group.rs

@@ -17,6 +17,9 @@ pub struct Group {
 }
 
 impl Group {
+    /// The name of the group to which all plugins belong by default.
+    pub const DEFAULT_NAME: &'static str = "default";
+
     /// Construct a [Group] with the given name.
     #[must_use]
     pub fn new(name: String) -> Self {
@@ -40,9 +43,6 @@ impl Group {
         self
     }
 
-    /// The name of the group to which all plugins belong by default.
-    pub const DEFAULT_NAME: &'static str = "default";
-
     /// Get the name of the group.
     pub fn name(&self) -> &str {
         &self.name