2.13.0 readiness

- Updates branch aliases
  - dev-master => 2.13.x-dev
  - dev-develop => 2.14.x-dev
- Updates CHANGELOG
  - Removes empty 2.12.3 stub
  - Sets release date for 2.13.0

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 2.13.0 - TBD
+## 2.13.0 - 2019-12-27
 
 ### Added
 
@@ -30,28 +30,6 @@ All notable changes to this project will be documented in this file, in reverse
 
 - Nothing.
 
-## 2.12.3 - TBD
-
-### Added
-
-- Nothing.
-
-### Changed
-
-- Nothing.
-
-### Deprecated
-
-- Nothing.
-
-### Removed
-
-- Nothing.
-
-### Fixed
-
-- Nothing.
-
 ## 2.12.2 - 2019-10-29
 
 ### Added

composer.json

@@ -63,8 +63,8 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.12.x-dev",
-            "dev-develop": "2.13.x-dev"
+            "dev-master": "2.13.x-dev",
+            "dev-develop": "2.14.x-dev"
         },
         "zf": {
             "component": "Zend\\Validator",