Merge branch '26-remove-travis-ci-configuration' into 'develop'

TASK: Remove travis-ci configuration

Closes #26

See merge request !23

.travis.yml

-language: php
-
-cache:
-  directories:
-    - $HOME/.composer/cache
-
-php:
-  - '5.3'
-  - '5.4'
-  - '5.5'
-  - '5.6'
-  - '7.0'
-  - '7.1'
-
-install:
-  - 'composer install --prefer-dist'
-
-script:
-  - 'php vendor/bin/phpunit -c phpunit.xml.dist'

README.md

@@ -3,7 +3,7 @@ About
 
 Composer plugin installs [PHP_CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) Standards.
 
-[![Build Status](https://travis-ci.org/higidi/composer-phpcodesniffer-standards-plugin.svg?branch=master)](https://travis-ci.org/higidi/composer-phpcodesniffer-standards-plugin) [![Latest Stable Version](https://poser.pugx.org/higidi/composer-phpcodesniffer-standards-plugin/v/stable)](https://packagist.org/packages/higidi/composer-phpcodesniffer-standards-plugin) [![Total Downloads](https://poser.pugx.org/higidi/composer-phpcodesniffer-standards-plugin/downloads)](https://packagist.org/packages/higidi/composer-phpcodesniffer-standards-plugin) [![License](https://poser.pugx.org/higidi/composer-phpcodesniffer-standards-plugin/license)](https://packagist.org/packages/higidi/composer-phpcodesniffer-standards-plugin)
+[![Latest Stable Version](https://poser.pugx.org/higidi/composer-phpcodesniffer-standards-plugin/v/stable)](https://packagist.org/packages/higidi/composer-phpcodesniffer-standards-plugin) [![Total Downloads](https://poser.pugx.org/higidi/composer-phpcodesniffer-standards-plugin/downloads)](https://packagist.org/packages/higidi/composer-phpcodesniffer-standards-plugin) [![License](https://poser.pugx.org/higidi/composer-phpcodesniffer-standards-plugin/license)](https://packagist.org/packages/higidi/composer-phpcodesniffer-standards-plugin)
 
 Requirements
 ------------