feature #865 Updated the app to Symfony 4.2.x-dev (javiereguiluz)

This PR was merged into the master branch.

Discussion
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Updated the app to Symfony 4.2.x-dev

As we usually do, now that Symfony 4.2 is in feature freeze, let's update this app to `4.2.x-dev` so we can detect issues/bugs/deprecations early and report to the appropriate repositories.

Commits
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f1840d2 Updated the app to Symfony 4.2.x-dev

Author: javiereguiluz

composer.json

@@ -3,6 +3,7 @@
     "license": "MIT",
     "type": "project",
     "description": "Symfony Demo Application",
+    "minimum-stability": "dev",
     "require": {
         "php": "^7.1.3",
         "ext-pdo_sqlite": "*",
@@ -12,35 +13,35 @@
         "erusev/parsedown": "^1.6",
         "ezyang/htmlpurifier": "^4.9",
         "sensio/framework-extra-bundle": "^5.0",
-        "sensiolabs/security-checker": "^4.1",
-        "symfony/asset": "^4.1",
-        "symfony/expression-language": "^4.1",
+        "sensiolabs/security-checker": "dev-master",
+        "symfony/asset": "4.2.x-dev",
+        "symfony/expression-language": "4.2.x-dev",
         "symfony/flex": "^1.1",
-        "symfony/form": "^4.1",
-        "symfony/framework-bundle": "^4.1",
+        "symfony/form": "4.2.x-dev",
+        "symfony/framework-bundle": "4.2.x-dev",
         "symfony/monolog-bundle": "^3.1",
         "symfony/polyfill-php72": "^1.8",
-        "symfony/security-bundle": "^4.1",
+        "symfony/security-bundle": "4.2.x-dev",
         "symfony/swiftmailer-bundle": "^3.1",
-        "symfony/translation": "^4.1",
-        "symfony/twig-bundle": "^4.1",
-        "symfony/validator": "^4.1",
-        "symfony/yaml": "^4.1",
+        "symfony/translation": "4.2.x-dev",
+        "symfony/twig-bundle": "4.2.x-dev",
+        "symfony/validator": "4.2.x-dev",
+        "symfony/yaml": "4.2.x-dev",
         "twig/extensions": "^1.5",
         "white-october/pagerfanta-bundle": "^1.1"
     },
     "require-dev": {
         "dama/doctrine-test-bundle": "^5.0",
         "doctrine/doctrine-fixtures-bundle": "^3.0",
         "friendsofphp/php-cs-fixer": "^2.12",
-        "symfony/browser-kit": "^4.1",
-        "symfony/css-selector": "^4.1",
-        "symfony/debug-bundle": "^4.1",
-        "symfony/dotenv": "^4.1",
-        "symfony/phpunit-bridge": "^4.1",
-        "symfony/stopwatch": "^4.1",
-        "symfony/web-profiler-bundle": "^4.1",
-        "symfony/web-server-bundle": "^4.1"
+        "symfony/browser-kit": "4.2.x-dev",
+        "symfony/css-selector": "4.2.x-dev",
+        "symfony/debug-bundle": "4.2.x-dev",
+        "symfony/dotenv": "4.2.x-dev",
+        "symfony/phpunit-bridge": "4.2.x-dev",
+        "symfony/stopwatch": "4.2.x-dev",
+        "symfony/web-profiler-bundle": "4.2.x-dev",
+        "symfony/web-server-bundle": "4.2.x-dev"
     },
     "config": {
         "platform": {
@@ -79,8 +80,7 @@
     },
     "extra": {
         "symfony": {
-            "allow-contrib": true,
-            "require": "4.1.*"
+            "allow-contrib": true
         }
     }
 }