title: Unable to bind v-model with vue-date-picker
body: <p>I have used <strong>vue-date-picker</strong> and <strong>v-model</strong> for two way data binding. Initially I have set value to date(i.e. <strong>startDate</strong> in this case) and in console I am printing that passed value(i.e. <strong>startDate</strong>). At first, that passed value to startDate (i.e. <strong>2019-09-17</strong> is printed) but when I chose new Date, startDate value didn't get updated rather value remained same as it was when it was initially passed.</p>
  
  <pre><code>       &lt;div class="col-md-3"&gt;
              &lt;label for="startDate" class&gt;Start Date&lt;/label&gt;
              &lt;datepicker v-model="startDate" :readonly="true" format="YYYY-MM-DD" name="startDate"&gt; 
              &lt;/datepicker&gt;
         &lt;/div&gt;
         &lt;p&gt;Start Date: {{startDate}}&lt;/p&gt;
  
         &lt;div class="col-md-2"&gt;
           &lt;div class="md-form mb-0"&gt;
             &lt;button type="button" class="btn btn-primary" @click="showDateValues"&gt;Apply&lt;/button&gt;
           &lt;/div&gt;
         &lt;/div&gt;
  </code></pre>
  
  <blockquote>
    <p>import datepicker from "vue-date-picker";</p>
  </blockquote>
  
  <pre><code>&lt;script&gt;
  import datepicker from "vue-date-picker";
  
  export default {
    name: "Example",
    components: {
      datepicker
    },
    data() {
      return {
        startDate: "2019-09-17"
      };
    },
    methods:{
      showDateValues(){
        console.log("Start Date: "+this.startDate)
      }
    }
  };
  &lt;/script&gt;
  </code></pre>