message: chart_with_upwards_trend: Ajout du tracking pour le click sur les boutons feedbacks
diff: import React, { Component } from 'react'
  import './Sondage.css'
  import { connect } from 'react-redux'
  +import ReactPiwik from './Tracker'
  import ReactCSSTransitionGroup from 'react-addons-css-transition-group'
  import Smiley from './SatisfactionSmiley'
  import TypeFormEmbed from './TypeFormEmbed'
  @@ -51,6 +52,7 @@ export default class Sondage extends Component {
  document.cookie = 'feedback_asked=true;'
  }
  onSmileyClick = satisfaction => {
  + ReactPiwik.push(['trackEvent', 'feedback', 'smiley', satisfaction])
  this.setState({ showForm: true, satisfaction, visible: false })
  this.setCookie()
  }
  