Check app version, fix close stream bug, show audiobook progress, add toasts

plugins/toast.js

@@ -0,0 +1,10 @@
+import Vue from "vue";
+import Toast from "vue-toastification";
+import "vue-toastification/dist/index.css";
+
+const options = {
+  hideProgressBar: true,
+  position: 'bottom-center'
+};
+
+Vue.use(Toast, options);