Merge pull request #169 from romain-pierre/symfony4

[WIP] Adds support for Symfony 4

Author: floriansemm

composer.json

@@ -13,10 +13,10 @@
   "require": {
     "php": "^7.0",
     "solarium/solarium": "^3.6",
-    "symfony/dependency-injection": "^2.3|^3.0",
-    "symfony/http-kernel": "^2.3|^3.0",
-    "symfony/config": "^2.3|^3.0",
-    "symfony/doctrine-bridge": "^2.3|^3.0",
+    "symfony/dependency-injection": "^2.3|^3.0|^4.0",
+    "symfony/http-kernel": "^2.3|^3.0|^4.0",
+    "symfony/config": "^2.3|^3.0|^4.0",
+    "symfony/doctrine-bridge": "^2.3|^3.0|^4.0",
     "minimalcode/search": "^1.0",
     "ramsey/uuid": "^3.5"
   },