Update readme.md for refreshDelay setting (#194)

Author: Vigilans

README.md

@@ -30,6 +30,7 @@ A lightweight extension to provide additional Java project explorer features. It
 | `java.dependency.showOutline` | Specify whether to show the outline in the dependency viewer. | `true` |
 | `java.dependency.syncWithFolderExplorer` | Specify whether to sync the folder with dependency viewer when browsering files.  | `true` |
 | `java.dependency.autoRefresh` | Specify whether to automatically sync the change from editor to the dependency viewer. | `true` |
+| `java.dependency.refreshDelay` | The delay time (ms) the auto refresh is invoked when changes are detected. | `2000ms` |
 | `java.dependency.packagePresentation` | Specify how to display the package. Supported values are: `flat`, `hierarchical`.| `flat` |
 
 ## Contribution