Bump yiisoft/yii2 from 2.0.15.1 to 2.0.38

Bumps [yiisoft/yii2](https://github.com/yiisoft/yii2-framework) from 2.0.15.1 to 2.0.38.
- [Release notes](https://github.com/yiisoft/yii2-framework/releases)
- [Changelog](https://github.com/yiisoft/yii2-framework/blob/master/CHANGELOG.md)
- [Commits](yiisoft/yii2-framework@2.0.15.1...2.0.38)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

composer.json

@@ -11,7 +11,7 @@
     "minimum-stability": "stable",
     "require": {
         "php": ">=5.4.0",
-        "yiisoft/yii2": "2.0.15.1",
+        "yiisoft/yii2": "2.0.38",
         "yiisoft/yii2-bootstrap": "*",
         "yiisoft/yii2-swiftmailer": "2.0.7",
         "branchonline/yii2-lightbox": "*",