[TASK] Tag version 4.0.0 and set state to stable.

Author: kszymukowicz

CHANGELOG.rst

@@ -2,7 +2,7 @@
 Changelog
 ---------
 
-master
+4.0.0
 ~~~~~
 
 1) [FEATURE][BREAKING] So far imageopt was forcing all images to be resized on fronted by default. Right now its

ext_emconf.php

@@ -12,8 +12,8 @@
  'title' => 'Optimize images created/resized by TYPO3',
  'description' => 'Optimize images created/resized by TYPO3 so they take less space. Cron based. Support for linux native commands.',
  'category' => 'be',
- 'version' => '2.0.0',
- 'state' => 'beta',
+ 'version' => '4.0.0',
+ 'state' => 'stable',
  'uploadfolder' => false,
  'createDirs' => '',
  'clearcacheonload' => false,