Update .travis.yml

Author: amacneil

.travis.yml

@@ -6,15 +6,7 @@ php:
   - 5.5
   - hhvm
 
-env:
-  - SYMFONY_VERSION="2.1" GUZZLE_VERSION="3.1"
-  - SYMFONY_VERSION="2.*" GUZZLE_VERSION="3.1"
-  - SYMFONY_VERSION="2.1" GUZZLE_VERSION="3.*"
-  - SYMFONY_VERSION="2.*" GUZZLE_VERSION="3.*"
-
 before_script:
-  - composer require symfony/http-foundation:${SYMFONY_VERSION} --no-update
-  - composer require guzzle/http:${GUZZLE_VERSION} --no-update
   - composer install -n --dev --prefer-source
 
 script: vendor/bin/phpcs --standard=PSR2 src && vendor/bin/phpunit --coverage-text