README: Update for 2.8 release

README.md

 # Doctrine DBAL
 
-| [Master][Master] | [2.7][2.7] | [2.6][2.6] | [Develop][develop] |
+| [Master][Master] | [2.8][2.8] | [2.7][2.7] | [Develop][develop] |
 |:----------------:|:----------:|:----------:|:--------------:|
-| [![Build status][Master image]][Master] | [![Build status][2.7 image]][2.7] | [![Build status][2.6 image]][2.6] | [![Build status][develop image]][develop] |
-| [![Build Status][ContinuousPHP image]][ContinuousPHP] | [![Build Status][ContinuousPHP 2.7 image]][ContinuousPHP] | [![Build Status][ContinuousPHP 2.6 image]][ContinuousPHP] | [![Build Status][ContinuousPHP develop image]][ContinuousPHP] |
-| [![Code Coverage][Coverage image]][Scrutinizer Master] | [![Code Coverage][Coverage 2.7 image]][Scrutinizer 2.7] | [![Code Coverage][Coverage 2.6 image]][Scrutinizer 2.6] | [![Code Coverage][Coverage develop image]][Scrutinizer develop] |
-| [![Code Quality][Quality image]][Scrutinizer Master] | [![Code Quality][Quality 2.7 image]][Scrutinizer 2.7] | [![Code Quality][Quality 2.6 image]][Scrutinizer 2.6] | [![Code Quality][Quality develop image]][Scrutinizer develop] |
-| [![AppVeyor][AppVeyor master image]][AppVeyor master] | [![AppVeyor][AppVeyor 2.7 image]][AppVeyor 2.7] | | [![AppVeyor][AppVeyor develop image]][AppVeyor develop] |
+| [![Build status][Master image]][Master] | [![Build status][2.8 image]][2.8] | [![Build status][2.7 image]][2.7] | [![Build status][develop image]][develop] |
+| [![Build Status][ContinuousPHP image]][ContinuousPHP] | [![Build Status][ContinuousPHP 2.8 image]][ContinuousPHP] | [![Build Status][ContinuousPHP 2.7 image]][ContinuousPHP] | [![Build Status][ContinuousPHP develop image]][ContinuousPHP] |
+| [![Code Coverage][Coverage image]][Scrutinizer Master] | [![Code Coverage][Coverage 2.8 image]][Scrutinizer 2.8] | [![Code Coverage][Coverage 2.7 image]][Scrutinizer 2.7] | [![Code Coverage][Coverage develop image]][Scrutinizer develop] |
+| [![Code Quality][Quality image]][Scrutinizer Master] | [![Code Quality][Quality 2.8 image]][Scrutinizer 2.8] | [![Code Quality][Quality 2.7 image]][Scrutinizer 2.7] | [![Code Quality][Quality develop image]][Scrutinizer develop] |
+| [![AppVeyor][AppVeyor master image]][AppVeyor master] | [![AppVeyor][AppVeyor 2.8 image]][AppVeyor 2.8] | [![AppVeyor][AppVeyor 2.7 image]][AppVeyor 2.7] | [![AppVeyor][AppVeyor develop image]][AppVeyor develop] |
 
 Powerful database abstraction layer with many features for database schema introspection, schema management and PDO abstraction.
 
@@ -26,6 +26,14 @@ Powerful database abstraction layer with many features for database schema intro
   [AppVeyor master]: https://ci.appveyor.com/project/doctrine/dbal/branch/master
   [AppVeyor master image]: https://ci.appveyor.com/api/projects/status/i88kitq8qpbm0vie/branch/master?svg=true
   [ContinuousPHP]: https://continuousphp.com/git-hub/doctrine/dbal
+  [2.8 image]: https://img.shields.io/travis/doctrine/dbal/2.8.svg?style=flat-square
+  [Coverage 2.8 image]: https://img.shields.io/scrutinizer/coverage/g/doctrine/dbal/2.8.svg?style=flat-square
+  [Quality 2.8 image]: https://img.shields.io/scrutinizer/g/doctrine/dbal/2.8.svg?style=flat-square
+  [ContinuousPHP 2.8 image]: https://img.shields.io/continuousphp/git-hub/doctrine/dbal/2.8.svg?style=flat-square
+  [2.8]: https://github.com/doctrine/dbal/tree/2.8
+  [Scrutinizer 2.8]: https://scrutinizer-ci.com/g/doctrine/dbal/?branch=2.8
+  [AppVeyor 2.8]: https://ci.appveyor.com/project/doctrine/dbal/branch/2.8
+  [AppVeyor 2.8 image]: https://ci.appveyor.com/api/projects/status/i88kitq8qpbm0vie/branch/2.8?svg=true
   [2.7 image]: https://img.shields.io/travis/doctrine/dbal/2.7.svg?style=flat-square
   [Coverage 2.7 image]: https://img.shields.io/scrutinizer/coverage/g/doctrine/dbal/2.7.svg?style=flat-square
   [Quality 2.7 image]: https://img.shields.io/scrutinizer/g/doctrine/dbal/2.7.svg?style=flat-square
@@ -34,12 +42,6 @@ Powerful database abstraction layer with many features for database schema intro
   [Scrutinizer 2.7]: https://scrutinizer-ci.com/g/doctrine/dbal/?branch=2.7
   [AppVeyor 2.7]: https://ci.appveyor.com/project/doctrine/dbal/branch/2.7
   [AppVeyor 2.7 image]: https://ci.appveyor.com/api/projects/status/i88kitq8qpbm0vie/branch/2.7?svg=true
-  [2.6 image]: https://img.shields.io/travis/doctrine/dbal/2.6.svg?style=flat-square
-  [Coverage 2.6 image]: https://img.shields.io/scrutinizer/coverage/g/doctrine/dbal/2.6.svg?style=flat-square
-  [Quality 2.6 image]: https://img.shields.io/scrutinizer/g/doctrine/dbal/2.6.svg?style=flat-square
-  [ContinuousPHP 2.6 image]: https://img.shields.io/continuousphp/git-hub/doctrine/dbal/2.6.svg?style=flat-square
-  [2.6]: https://github.com/doctrine/dbal/tree/2.6
-  [Scrutinizer 2.6]: https://scrutinizer-ci.com/g/doctrine/dbal/?branch=2.6
   [develop]: https://github.com/doctrine/dbal/tree/develop
   [develop image]: https://img.shields.io/travis/doctrine/dbal/develop.svg?style=flat-square
   [Coverage develop image]: https://img.shields.io/scrutinizer/coverage/g/doctrine/dbal/develop.svg?style=flat-square