Update README.md

Author: Team-on

README.md

@@ -119,6 +119,11 @@ You can install it via [openupm-cli](https://github.com/openupm/openupm-cli).
 openupm add com.teamon.buildmanager
 ```
 
+### (For Unity 2019.2 or later) Through Unity Package Manager
+ * MenuItem - Window - Package Manager
+ * Add package from git url
+ * paste `https://github.com/Team-on/UnityBuildManager.git`
+
 ### (For Unity 2018.3 or later) Using Git
 Find the manifest.json file in the Packages folder of your project and add a line to `dependencies` field.
 `"com.teamon.buildmanager": "https://github.com/Team-on/UnityBuildManager.git"`