Travis CI: Fix Symfony components install

.travis.yml

@@ -23,10 +23,11 @@ env:
 before_install:
  - if echo "$TRAVIS_COMMIT_MESSAGE" | grep -F -q "[skip travis]" ; then echo "[skip travis] has been found, exiting" && exit 0 ; else echo "[skip travis] has not been found, continuing" ; fi
  - if [[ $TRAVIS_PHP_VERSION = '7.2' && $SYMFONY_VERSION = '3.4.*' ]]; then DEPENDENCY="codeclimate/php-test-reporter:~0.3 satooshi/php-coveralls:~1.0"; PHPUNIT_FLAGS="--coverage-clover ./build/logs/clover.xml"; else DEPENDENCY=""; PHPUNIT_FLAGS=""; fi
+ - if [[ $SYMFONY_VERSION = '3.4.*' ]]; then SYMFONY_LTS="symfony/lts v3"; else SYMFONY_LTS=""; fi
  - if [[ $PHPUNIT_FLAGS = "" ]]; then phpenv config-rm xdebug.ini; fi
 
 install:
-  - composer require symfony/symfony:${SYMFONY_VERSION} $DEPENDENCY --no-update
+  - composer require symfony/config:${SYMFONY_VERSION} symfony/form:${SYMFONY_VERSION} symfony/framework-bundle:${SYMFONY_VERSION} symfony/templating:${SYMFONY_VERSION} symfony/security-csrf:${SYMFONY_VERSION} symfony/var-dumper:${SYMFONY_VERSION} $SYMFONY_LTS $DEPENDENCY --no-update
   - composer install --no-interaction --profile --no-progress
 
 script: