Prepare version numbers for 4.9.0-dev; update master to 4.9.0-dev

Signed-off-by: Isaac Bennetch <bennetch@gmail.com>

ChangeLog

@@ -1,6 +1,8 @@
 phpMyAdmin - ChangeLog
 ======================
 
+4.9.0 (not yet released)
+
 4.8.0 (not yet released)
 - issue #12946 Allow to export JSON with unescaped unicode chars
 - issue #12983 Disable login button without solved reCaptcha

README

@@ -1,7 +1,7 @@
 phpMyAdmin - Readme
 ===================
 
-Version 4.8.0-rc1
+Version 4.9.0-dev
 
 A web interface for MySQL and MariaDB.
 

doc/conf.py

@@ -51,7 +51,7 @@ copyright = u'2012 - 2017, The phpMyAdmin devel team'
 # built documents.
 #
 # The short X.Y version.
-version = '4.8.0-rc1'
+version = '4.9.0-dev'
 # The full version, including alpha/beta/rc tags.
 release = version
 

libraries/classes/Config.php

@@ -116,7 +116,7 @@ class Config
      */
     public function checkSystem()
     {
-        $this->set('PMA_VERSION', '4.8.0-rc1');
+        $this->set('PMA_VERSION', '4.9.0-dev');
         /* Major version */
         $this->set(
             'PMA_MAJOR_VERSION',