Fixed composer.json for basic app template

composer.json

@@ -15,15 +15,15 @@
     "minimum-stability": "dev",
     "require": {
         "php": ">=5.4.0",
-        "yiisoft/yii2": "*",
-        "yiisoft/yii2-bootstrap": "*",
-        "yiisoft/yii2-swiftmailer": "*"
+        "yiisoft/yii2": "~2.0.0",
+        "yiisoft/yii2-bootstrap": "~2.0.0",
+        "yiisoft/yii2-swiftmailer": "~2.0.0"
     },
     "require-dev": {
-        "yiisoft/yii2-codeception": "*",
-        "yiisoft/yii2-debug": "*",
-        "yiisoft/yii2-gii": "*",
-        "yiisoft/yii2-faker": "*"
+        "yiisoft/yii2-codeception": "~2.0.0",
+        "yiisoft/yii2-debug": "~2.0.0",
+        "yiisoft/yii2-gii": "~2.0.0",
+        "yiisoft/yii2-faker": "~2.0.0"
     },
     "config": {
         "process-timeout": 1800