Release 38.0.0.

Author: thangduo

.gitattributes

@@ -1,2 +1,27 @@
+### Composer ###
+composer.phar
 /vendor/
-/composer.lock
+
+# Ignore a library lock file https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies
+composer.lock
+
+
+### macOS ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+
+### PhpStorm ###
+.idea/
+
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+.history
+
+

.gitignore

@@ -1,3 +1,19 @@
+### 38.0.0
+
+##### AdWords
+
+*   Added Smart Shopping ad example (v201809).
+*   Fixed [issue #541](https://github.com/googleads/googleads-php-lib/issues/541).
+
+##### Ad Manager
+
+*   Added support for v201811.
+*   Removed support for v201711.
+*   Removed examples for v201802.
+*   Updated the `Util/v201811/AdManagerDateTimes.php` class for renaming the
+function `setTimeZoneID` to `setTimeZoneId`.
+*   Discontinue the `GetAllContentMetadataKeyHierarchies.php` example.
+
 ### 37.1.0
 
 ##### AdWords