Allow Symfony 5 installation (#2)

Author: alexander-schranz

composer.json

@@ -16,11 +16,11 @@
     ],
     "require": {
         "php": "^5.6|^7.0",
-        "symfony/framework-bundle": "^2.8|^3.0|^4",
-        "symfony/console": "^2.8|^3.0|^4",
-        "symfony/stopwatch": "^2.8|^3.0|^4",
-        "symfony/templating": "^2.8|^3.0|^4",
-        "symfony/asset": "^2.8|^3.0|^4",
+        "symfony/framework-bundle": "^2.8|^3.0|^4|^5",
+        "symfony/console": "^2.8|^3.0|^4|^5",
+        "symfony/stopwatch": "^2.8|^3.0|^4|^5",
+        "symfony/templating": "^2.8|^3.0|^4|^5",
+        "symfony/asset": "^2.8|^3.0|^4|^5",
         "doctrine/annotations": "~1.2",
         "doctrine/inflector": "~1.0",
         "doctrine/cache": "~1.4",
@@ -34,15 +34,15 @@
         "phpunit/phpunit": "~5.6",
         "squizlabs/php_codesniffer": "~2.0",
         "satooshi/php-coveralls": "~1.0",
-        "symfony/browser-kit" : "^3.4|^4",
-        "symfony/expression-language" : "^3.4|^4",
-        "symfony/twig-bundle": "^3.4|^4",
-        "symfony/serializer": "^3.4|^4",
-        "symfony/yaml": "^3.4|^4",
-        "symfony/dependency-injection": "^3.4|^4",
-        "symfony/validator": "^3.4|^4",
-        "symfony/options-resolver": "^3.4|^4",
-        "symfony/var-dumper": "^3.4|^4"
+        "symfony/browser-kit" : "^3.4|^4|^5",
+        "symfony/expression-language" : "^3.4|^4|^5",
+        "symfony/twig-bundle": "^3.4|^4|^5",
+        "symfony/serializer": "^3.4|^4|^5",
+        "symfony/yaml": "^3.4|^4|^5",
+        "symfony/dependency-injection": "^3.4|^4|^5",
+        "symfony/validator": "^3.4|^4|^5",
+        "symfony/options-resolver": "^3.4|^4|^5",
+        "symfony/var-dumper": "^3.4|^4|^5"
     },
     "autoload": {
         "psr-4": { "ONGR\\ElasticsearchBundle\\": "" },