Change Travis build matrix for new Symfony releases

Closes #11

Author: curry684

.travis.yml

@@ -12,22 +12,23 @@ matrix:
     include:
      - php: 7.0
        env: SYMFONY_VERSION=^3.3
+     - php: 7.0
+       env: SYMFONY_VERSION=^3.4
      - php: 7.0
        env: COMPOSER_FLAGS="--prefer-lowest"
      - php: 7.1
-       env:
-        - SYMFONY_VERSION=^3.4
-        - DEPENDENCIES=beta
+       env: SYMFONY_VERSION=^3.4
      - php: 7.2
-       env: DEPENDENCIES=beta
+       env: DEPENDENCIES=dev
      - php: nightly
        env: COMPOSER_FLAGS="--ignore-platform-reqs"
     allow_failures:
      - php: nightly
+     - env: DEPENDENCIES=dev
 
 before_install:
   - composer self-update
-  - if [ "$DEPENDENCIES" = "beta" ]; then composer config minimum-stability beta; fi;
+  - if [ "$DEPENDENCIES" != "" ]; then composer config minimum-stability ${DEPENDENCIES}; fi;
   - if [ "$SYMFONY_VERSION" != "" ]; then composer require "symfony/symfony:${SYMFONY_VERSION}" --no-update; fi;
 
 before_script: