Allow the bundle to use symfony 2.7 or 2.8 version (#15)

* Allow the bundle to use symfony 2.7 or 2.8 version

* [composer.json] Fix logical comparator syntax

Author: aliel

.travis.yml

@@ -17,6 +17,8 @@ env:
         - SYMFONY_VERSION=3.2.*
         - SYMFONY_VERSION=3.1.*
         - SYMFONY_VERSION=3.0.*
+        - SYMFONY_VERSION=2.8.*
+        - SYMFONY_VERSION=2.7.*
 
 branches:
     except:
@@ -29,6 +31,8 @@ matrix:
           env: SYMFONY_VERSION="3.2.* graphaware/neo4j-php-ogm:^1.0"
         - php: 7.0
           env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" COVERAGE=true TEST_COMMAND="composer test-ci" SYMFONY_VERSION=3.0.*
+        - php: 7.0
+          env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" COVERAGE=true TEST_COMMAND="composer test-ci" SYMFONY_VERSION=2.7.*
 
 install:
     - composer require symfony/symfony:${SYMFONY_VERSION} --no-update

composer.json

@@ -17,12 +17,12 @@
     "require": {
         "php": "^7.0",
         "graphaware/neo4j-php-client": "^4.6.4",
-        "symfony/framework-bundle": "^3.0",
+        "symfony/framework-bundle": "^2.7 || ^3.0",
         "graphaware/neo4j-bolt": "^1.6"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.4",
-        "symfony/symfony": "^3.0",
+        "symfony/symfony": "^2.7 || ^3.0",
         "matthiasnoback/symfony-dependency-injection-test": "^1.0"
     },
     "suggest": {