Adjusted composer.json and travis.yml

Author: DonCallisto

.travis.yml

@@ -4,6 +4,7 @@ php:
   - 5.6
   - 7.0
   - 7.1
+  - 7.2
   - hhvm
 
 env:
@@ -28,5 +29,5 @@ script:
   - find tests/ -name "*Test.php" | php fastest -v
   - bin/behat --config=adapters/Behat2/behat.yml
   - composer require --dev "behat/behat:~3.3" --no-update # update the Behat version.
-  - composer update --prefer-source $PREFER_LOWEST
+  - composer update $PREFER_LOWEST
   - bin/behat --config=adapters/Behat/behat.yml

composer.json

@@ -10,9 +10,9 @@
     ],
     "require": {
         "php": ">=5.6",
-        "symfony/console": "~2.7|~3.0|~4.0",
-        "symfony/stopwatch": "~2.7|~3.0|~4.0",
-        "symfony/process": "~2.7|~3.0|~4.0",
+        "symfony/console": ">=2.7 <5.0",
+        "symfony/stopwatch": ">=2.7 <5.0",
+        "symfony/process": ">=2.7 <5.0",
         "doctrine/collections" : "~1.2",
         "phpunit/phpunit": "^5.7|^6.1"
     },