Iron out version constraints

Author: trappar

.travis.yml

@@ -8,8 +8,6 @@ php:
 matrix:
   fast_finish: true
   include:
-    - php: '7.1'
-      env: SYMFONY_VERSION="~2.7.0"
     - php: '7.1'
       env: SYMFONY_VERSION="^3.0"
     - php: '7.1'

composer.json

@@ -15,15 +15,15 @@
         "trappar/alice-generator": "^0.3",
         "doctrine/orm": "~2.4",
         "doctrine/doctrine-bundle": "^1.6",
-        "symfony/finder": "^2.7|^3.0|^4.0",
-        "symfony/validator": "^2.5|^3.0",
-        "symfony/console": "^2.5|^3.0|^4.0",
-        "symfony/framework-bundle": "^2.5|^3.0|^4.0",
-        "symfony/yaml": "^2.8|^3.0|^4.0",
-        "symfony/phpunit-bridge": "^2.7.4|^3.0|^4.0"
+        "symfony/finder": "^3.0|^4.0",
+        "symfony/validator": "^3.0|^4.0",
+        "symfony/console": "^3.0|^4.0",
+        "symfony/framework-bundle": "^3.0|^4.0",
+        "symfony/yaml": "^3.0|^4.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.1",
+        "symfony/phpunit-bridge": "^3.0|^4.0",
         "matthiasnoback/symfony-dependency-injection-test": "^3.0"
     },
     "minimum-stability": "dev",