MDB Vue tags not working

Hello, I'm creating an app with vue cli. I have created project with axios (routing) and I want to add MDB Vue to this project but I have problems. I have installed MDB Vue to existing project via:

npm install --save mdbvue

I have added to my src/main.js file:

import 'bootstrap-css-only/css/bootstrap.min.css'; 
import 'mdbvue/build/css/mdb.css';

Normal MD Bootstrap is working, eg. I can add button with class from MDB but if I want to use tag it won't work. It will be working only when I import { mdbBtn } from 'mdbvue':

<template>
<div>
  <button class="btn peach-gradient">Peach</button>
  <mdb-btn color="primary">Primary</mdb-btn>
</div>
</template>

<script>
import { mdbBtn } from 'mdbvue';

export default {
  name: "login",
  components: {
    "mdb-btn": mdbBtn
  }
}
</script>

But I don't want to import components all time in script tag. Should I add something to my project? Vue.use() in src/main.js or something like that?

Edit: The same problem appears when I choose direct download package. I do every step same as in tutorial video and it doesn't work - I can't use mdb tags.