Bump dependencies and allow symfony3

composer.json

@@ -22,21 +22,21 @@
         "issues": "https://github.com/composer/composer/issues"
     },
     "require": {
-        "php": ">=5.3.2",
+        "php": "^5.3.2 || ^7.0",
         "justinrainbow/json-schema": "^1.4.4",
         "composer/spdx-licenses": "^1.0",
         "composer/semver": "^1.0",
-        "seld/jsonlint": "~1.0",
-        "symfony/console": "~2.5",
-        "symfony/finder": "~2.2",
-        "symfony/process": "~2.1",
-        "symfony/filesystem": "~2.5",
-        "seld/phar-utils": "~1.0",
-        "seld/cli-prompt": "~1.0"
+        "seld/jsonlint": "^1.0",
+        "symfony/console": "^2.5 || ^3.0",
+        "symfony/finder": "^2.2 || ^3.0",
+        "symfony/process": "^2.1 || ^3.0",
+        "symfony/filesystem": "^2.5 || ^3.0",
+        "seld/phar-utils": "^1.0",
+        "seld/cli-prompt": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.5|^5.0.5",
-        "phpunit/phpunit-mock-objects": "2.3.0|~3.0"
+        "phpunit/phpunit": "^4.5|^5.0.5",
+        "phpunit/phpunit-mock-objects": "2.3.0|^3.0"
     },
     "_": "phpunit/phpunit-mock-objects required in 2.3.0 due to https://github.com/sebastianbergmann/phpunit-mock-objects/issues/223 - needs hhvm 3.8+ on travis",
     "config": {

composer.lock

@@ -4,8 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "299aaabeb02408df8d77b7b8920cb1fe",
-    "content-hash": "ef034b5b61856139fa515d678e2978fd",
+    "hash": "d4d0544aad98d29bd360f8f859704715",
+    "content-hash": "5788611d1b781358a9651a5b84b25c4b",
     "packages": [
         {
             "name": "composer/semver",
@@ -1483,7 +1483,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=5.3.2"
+        "php": "^5.3.2 || ^7.0"
     },
     "platform-dev": [],
     "platform-overrides": {