fix severity order, update changelog

Author: Johann150

codespan-reporting/CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 -   Add the option to display a configurable amount of lines in front of and after any label.
+-   The `Severity` enum now implements full `Ord`. (#335)
 
 ### Changed
 

codespan-reporting/src/diagnostic.rs

@@ -20,16 +20,16 @@ use std::string::ToString;
 #[derive(Copy, Clone, Hash, Debug, PartialEq, Eq, PartialOrd, Ord)]
 #[cfg_attr(feature = "serialization", derive(Serialize, Deserialize))]
 pub enum Severity {
-    /// An unexpected bug.
-    Bug,
-    /// An error.
-    Error,
-    /// A warning.
-    Warning,
-    /// A note.
-    Note,
     /// A help message.
     Help,
+    /// A note.
+    Note,
+    /// A warning.
+    Warning,
+    /// An error.
+    Error,
+    /// An unexpected bug.
+    Bug,
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd)]