[fixed] Vuejs warning about transition css usage

HTML attributes are case-insensitive and camelCased props need to use their kebab-case equivalents when using in-DOM templates.
You should probably use "leave-class" instead of "leaveClass". 
You should probably use "enter-to-class" instead of "enterToClass"

lib/components/tab.vue

@@ -1,5 +1,5 @@
 <template>
-    <transition enterToClass="show" leaveClass="show" @after-enter="afterEnter" mode="out-in">
+    <transition enter-to-class="show" leave-class="show" @after-enter="afterEnter" mode="out-in">
         <div role="tabpanel" class="tab-pane"
              :class="[{fade, disabled, active: localActive}]"
              v-if="localActive || !lazy" v-show="localActive || lazy"