Fix code sequence for initial rules

Author: benwebber

CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 
 ## [Unreleased]
 
+### Fixed
+
+* Fix code sequence for initial rules
+
 ### Removed
 
 * Remove unused method `Changelog::title`

README.md

@@ -38,15 +38,15 @@ The `h2` is not a valid unreleased or release section heading.
 
 The document does not have an unreleased section.
 
-### E102
+### E101
 
 There is more than one unreleased section heading in the document.
 
-### E201
+### E200
 
 The date is not in ISO 8601 format.
 
-### E202
+### E201
 
 The yanked token does not match `[YANKED]`.
 

src/rule.rs

@@ -70,18 +70,18 @@ rules! {
     ),
     DuplicateUnreleased = (
         "There is more than one unreleased section heading in the document.",
-        "E102",
+        "E101",
         "Duplicate unreleased section `{}`",
     ),
     // E200 Release
     InvalidDate = (
         "The date is not in ISO 8601 format.",
-        "E201",
+        "E200",
         "Invalid date `{}`",
     ),
     InvalidYanked = (
         "The yanked token does not match `[YANKED]`.",
-        "E202",
+        "E201",
         "Invalid [YANKED] format `{}`",
     ),
     // E300 Changes