Update Composer requirements and Travis build configuration

Author: pamil

.travis.yml

@@ -1,36 +1,36 @@
 language: php
 
+sudo: false
+
 matrix:
   include:
+    - php: 7.0
+      env: SYMFONY_VERSION=2.3.*
+    - php: 7.0
+      env: SYMFONY_VERSION=2.7.*
+    - php: 7.0
+      env: SYMFONY_VERSION=2.8.*
+    - php: 7.0
+      env: SYMFONY_VERSION=3.0.*
+    - php: 7.0
+      env: SYMFONY_VERSION=3.1.*
+    - php: 7.0
+      env: PHPUNIT_VERSION=^4.0
     - php: 5.6
-      env: SYMFONY_VERSION=2.0.* PHPUNIT_VERSION=~4.0
-    - php: 5.6
-      env: SYMFONY_VERSION=2.1.* PHPUNIT_VERSION=~4.0
-    - php: 5.6
-      env: SYMFONY_VERSION=2.2.* PHPUNIT_VERSION=~4.0
-    - php: 5.6
-      env: SYMFONY_VERSION=2.3.* PHPUNIT_VERSION=~4.0
-    - php: 5.6
-      env: SYMFONY_VERSION=2.4.* PHPUNIT_VERSION=~4.0
-    - php: 5.6
-      env: SYMFONY_VERSION=2.5.* PHPUNIT_VERSION=~4.0
-    - php: 5.6
-      env: SYMFONY_VERSION=2.6.* PHPUNIT_VERSION=~4.0
-    - php: 5.6
-      env: SYMFONY_VERSION=2.6.* PHPUNIT_VERSION=~3.7
     - php: hhvm
-      env: SYMFONY_VERSION=2.6.* PHPUNIT_VERSION=~4.0
-    - php: 5.6
-      env: SYMFONY_VERSION=2.7.* PHPUNIT_VERSION=~4.0
-    - php: 5.6
-      env: SYMFONY_VERSION=2.8.*@dev PHPUNIT_VERSION=~4.0
-    - php: 5.6
-      env: SYMFONY_VERSION=3.0.*@dev PHPUNIT_VERSION=~4.0
 
-before_script:
-  - composer require --no-update "symfony/config:${SYMFONY_VERSION}"
-  - composer require --dev --no-update "phpunit/phpunit:${PHPUNIT_VERSION}"
-  - composer update
+cache:
+  directories:
+    - ~/.composer/cache/files
+
+before_install:
+  - phpenv config-rm xdebug.ini || true
+  - composer self-update
+
+install:
+  - if [ ! -z ${SYMFONY_VERSION+x} ]; then composer require --no-update "symfony/config:${SYMFONY_VERSION}"; fi
+  - if [ ! -z ${PHPUNIT_VERSION+x} ]; then composer require --no-update "phpunit/phpunit:${PHPUNIT_VERSION}"; fi
+  - composer update --prefer-dist
 
 notifications:
   email: [email protected]

composer.json

@@ -13,12 +13,11 @@
         }
     ],
     "require": {
-        "php": ">=5.3",
-        "sebastian/exporter": "1.*",
-        "symfony/config": "~2.0|~3.0"
-    },
-    "require-dev": {
-        "phpunit/phpunit": ">=3.7"
+        "php": "^5.3|^7.0",
+
+        "phpunit/phpunit": "^4.0|^5.0",
+        "sebastian/exporter": "^1.0",
+        "symfony/config": "^2.3|^3.0"
     },
     "minimum-stability": "dev",
     "prefer-stable": true,