<template>
        <contributionCalendar :history="history" :year="2016" :cellClick="someMethod" />
    </template>

    <script>
      import contributionCalendar from 'vue-contribution-calenadar';

      export default {
        components: {
          contributionCalendar
        },
        methods: {
          someMethod(date, value) {
            ...
          }
        },
        data() {
          return {
            history: {
              '20-12-2016': 7,
               ...
              '11-1-2016': 1 
            }
          }
        },
      }
    </script>