updated required versions when depending on the Yaml component

The API has not changed since 2.0 and won't until 3.0.

src/Symfony/Bridge/Twig/composer.json

@@ -25,7 +25,7 @@
         "symfony/routing": "2.2.*",
         "symfony/templating": "2.2.*",
         "symfony/translation": "2.2.*",
-        "symfony/yaml": "2.2.*",
+        "symfony/yaml": "~2.0",
         "symfony/security": "2.2.*"
     },
     "suggest": {

src/Symfony/Component/DependencyInjection/composer.json

@@ -19,7 +19,7 @@
         "php": ">=5.3.3"
     },
     "require-dev": {
-        "symfony/yaml": "2.2.*",
+        "symfony/yaml": "~2.0",
         "symfony/config": "2.2.*"
     },
     "suggest": {

src/Symfony/Component/Routing/composer.json

@@ -20,7 +20,7 @@
     },
     "require-dev": {
         "symfony/config": "2.2.*",
-        "symfony/yaml": "2.2.*",
+        "symfony/yaml": "~2.0",
         "symfony/http-kernel": "2.2.*",
         "doctrine/common": "~2.2",
         "psr/log": "~1.0"

src/Symfony/Component/Translation/composer.json

@@ -20,7 +20,7 @@
     },
     "require-dev": {
         "symfony/config": "2.2.*",
-        "symfony/yaml": "2.2.*"
+        "symfony/yaml": "~2.2"
     },
     "suggest": {
         "symfony/config": "2.2.*",

src/Symfony/Component/Validator/composer.json

@@ -22,7 +22,7 @@
     "require-dev": {
         "symfony/http-foundation": "2.2.*",
         "symfony/locale": "2.2.*",
-        "symfony/yaml": "2.2.*",
+        "symfony/yaml": "~2.0",
         "symfony/config": "2.2.*"
     },
     "suggest": {