Remove double copyright (#802)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

src/main/menu.ts

@@ -42,7 +42,7 @@ export function buildMenu(windowManager: WindowManager) {
       `${appName}: ${app.getVersion()}`,
       `Electron: ${process.versions.electron}`,
       `Chrome: ${process.versions.chrome}`,
-      `Copyright 2020 Copyright 2020 Mirantis, Inc.`,
+      `Copyright 2020 Mirantis, Inc.`,
     ]
     dialog.showMessageBoxSync(browserWindow, {
       title: `${isWindows ? " ".repeat(2) : ""}${appName}`,