refresh asset database after revert

src/UnityExtension/Assets/Editor/GitHub.Unity/UI/HistoryView.cs

@@ -349,6 +349,7 @@ protected void RevertCommit()
                             EditorUtility.DisplayDialog(dialogTitle,
                                 "Error reverting commit: " + e.Message, Localization.Cancel);
                         }
+                        AssetDatabase.Refresh();
                     })
                     .Start();
             }