Fix clippy: Remove Default impl for Environment, derive it

Signed-off-by: Matthias Beyer <[email protected]>

Author: matthiasbeyer

src/env.rs

@@ -5,7 +5,7 @@ use crate::map::Map;
 use crate::source::Source;
 use crate::value::{Value, ValueKind};
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Default)]
 pub struct Environment {
     /// Optional prefix that will limit access to the environment to only keys that
     /// begin with the defined prefix.
@@ -63,17 +63,6 @@ impl Environment {
     }
 }
 
-impl Default for Environment {
-    fn default() -> Environment {
-        Environment {
-            prefix: None,
-            separator: None,
-            ignore_empty: false,
-            try_parsing: false,
-        }
-    }
-}
-
 impl Source for Environment {
     fn clone_into_box(&self) -> Box<dyn Source + Send + Sync> {
         Box::new((*self).clone())