release: 2.10.0 readiness

- Updates CHANGELOG:
  - Removes empty 2.9.3 changelog
  - Adds release date for 2.10.0 changelog
- Bumps branch aliases:
  - dev-master => 2.10.x-dev
  - dev-develop => 2.11.x-dev

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 2.10.0 - TBD
+## 2.10.0 - 2019-11-18
 
 ### Added
 
@@ -26,28 +26,6 @@ All notable changes to this project will be documented in this file, in reverse
 
 - Nothing.
 
-## 2.9.3 - TBD
-
-### Added
-
-- Nothing.
-
-### Changed
-
-- Nothing.
-
-### Deprecated
-
-- Nothing.
-
-### Removed
-
-- Nothing.
-
-### Fixed
-
-- Nothing.
-
 ## 2.9.2 - 2019-09-30
 
 ### Added

composer.json

@@ -56,8 +56,8 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.9.x-dev",
-            "dev-develop": "2.10.x-dev"
+            "dev-master": "2.10.x-dev",
+            "dev-develop": "2.11.x-dev"
         },
         "zf": {
             "component": "Zend\\I18n",