title: v-on:change does not work for vue-multiselect
body: <p>I am using vue-multiselect component in my vue.js project, I am using v-on directive to execute a function on the change event ,</p>
  
  <pre><code>&lt;multiselect v-model="selected" :options="projects" :searchable="false" :custom-label="customLabel" track-by="name" v-on:change="executeLoader"&gt;
  &lt;template slot="customLabel" slot-scope="{ customLabel }"&gt;&lt;strong&gt;{{ option.name }}&lt;/strong&gt;&lt;/template&gt;   
  &lt;/multiselect&gt;
  </code></pre>
  
  <p>I have example full code here: <a href="https://codesandbox.io/s/yjjon0vzxj" rel="noreferrer">https://codesandbox.io/s/yjjon0vzxj</a></p>
  
  <p>the <code>v-on:change</code> was working with <code>&lt;select&gt;</code> component but it stopped workigng with vue-multiselect ! I tried with <code>v-on:click="executeLoader"</code> but that too didnt worked either..</p>