title: ESLint in Vue : Missing space before function parentheses
body: <p>I created a project with npm and vuejs/vue-cli.
  I have eslint entries in my package.json file.</p>
  
  <p>I got a warning when running my code :</p>
  
  <blockquote>
    <p>WARNING  Compiled with 1 warnings<br>
    5:57:37 AM</p>
    
    <p>✘  <a href="http://eslint.org/docs/rules/space-before-function-paren" rel="nofollow noreferrer">http://eslint.org/docs/rules/space-before-function-paren</a>  Missing
    space before function parentheses   src/components/HomePage.vue:142:9
          show() {
               ^</p>
    
    <p>✘ 1 problem (1 error, 0 warnings)</p>
  </blockquote>
  
  <p>what should i do with the space in this line?</p>
  
  <pre><code>export default {
    el: '#skills',
    props: {
      skill: Object,
      selectedId: Number
    },
    computed: {
      show() { //in this line
        return this.skill.id === this.selectedId
      }
    },
  ...
  }
  </code></pre>