Merge branch '3.4' into 4.0

* 3.4: (84 commits)
  Adopt "flex-require" from v1.3
  Update dependencies - v3.4.28.7
  Update dependencies - v3.4.28.6
  Update dependencies - v3.4.28.5
  Update dependencies - v3.4.28.4
  Update dependencies - v3.4.28.3
  Update dependencies - v3.4.28.2
  Update dependencies - v3.4.28.1
  Update dependencies - v3.4.27.5
  Update dependencies - v3.4.27.4
  Update dependencies - v3.4.27.3
  Update dependencies - v3.4.27.2
  Update dependencies - v3.4.27.1
  Update dependencies - v3.4.26.2
  Update dependencies - v3.4.26.1
  Update dependencies - v3.4.24.2
  Update dependencies - v3.4.24.1
  Update dependencies - v3.4.23.3
  Update dependencies - v3.4.23.2
  Update dependencies - v3.4.23.1
  ...

Author: nicolas-grekas

composer.json

@@ -5,33 +5,36 @@
     "description": "A skeleton to start a new Symfony website",
     "require": {
         "php": "^7.1.3",
+        "ext-ctype": "*",
         "ext-iconv": "*",
+        "symfony/flex": "^1.3.1"
+    },
+    "flex-require": {
         "sensio/framework-extra-bundle": "^5.1",
-        "symfony/asset": "^4.0",
-        "symfony/console": "^4.0",
-        "symfony/expression-language": "^4.0",
-        "symfony/flex": "^1.0",
-        "symfony/form": "^4.0",
-        "symfony/framework-bundle": "^4.0",
-        "symfony/lts": "^4@dev",
+        "symfony/asset": "*",
+        "symfony/console": "*",
+        "symfony/dotenv": "*",
+        "symfony/expression-language": "*",
+        "symfony/form": "*",
+        "symfony/framework-bundle": "*",
         "symfony/monolog-bundle": "^3.1",
         "symfony/orm-pack": "*",
-        "symfony/process": "^4.0",
-        "symfony/security-bundle": "^4.0",
+        "symfony/process": "*",
+        "symfony/security-bundle": "*",
         "symfony/serializer-pack": "*",
         "symfony/swiftmailer-bundle": "^3.1",
-        "symfony/twig-bundle": "^4.0",
-        "symfony/validator": "^4.0",
-        "symfony/web-link": "^4.0",
-        "symfony/yaml": "^4.0"
+        "symfony/translation": "*",
+        "symfony/twig-bundle": "*",
+        "symfony/validator": "*",
+        "symfony/web-link": "*",
+        "symfony/yaml": "*"
     },
-    "require-dev": {
+    "flex-require-dev": {
         "symfony/debug-pack": "*",
-        "symfony/dotenv": "^4.0",
         "symfony/maker-bundle": "^1.0",
         "symfony/profiler-pack": "*",
-        "symfony/test-pack": "^1.0",
-        "symfony/web-server-bundle": "^4.0"
+        "symfony/test-pack": "*",
+        "symfony/web-server-bundle": "*"
     },
     "config": {
         "preferred-install": {
@@ -50,6 +53,8 @@
         }
     },
     "replace": {
+        "paragonie/random_compat": "2.*",
+        "symfony/polyfill-ctype": "*",
         "symfony/polyfill-iconv": "*",
         "symfony/polyfill-php71": "*",
         "symfony/polyfill-php70": "*",
@@ -70,7 +75,8 @@
     },
     "extra": {
         "symfony": {
-            "allow-contrib": false
+            "allow-contrib": false,
+            "require": "4.0.*"
         }
     }
 }