message: Refactor Home.js to prefer const over let
diff: -import React, { Component, Fragment } from 'react'
  +import React, { Component } from 'react'
  import actions from 'redux/actions'
  import { connect } from 'redaction'
  import { links } from 'helpers'
  import CurrencyDirectionChooser from 'components/CurrencyDirectionChooser/CurrencyDirectionChooser'
  -import SubTitle from 'components/PageHeadline/SubTitle/SubTitle'
  import PageHeadline from 'components/PageHeadline/PageHeadline'
  import Orders from './Orders/Orders'
  @@ -29,11 +28,7 @@ export default class Home extends Component {
  }
  componentWillMount() {
  - let { filter, match: { params: { buy, sell } } } = this.props
  -
  - if (typeof buy !== 'string' || typeof sell !== 'string') {
  - filter = filter.split('-')
  - }
  + const { match: { params: { buy, sell } } } = this.props
  if (buy !== this.state.sellCurrency || sell !== this.state.sellCurrency) {
  actions.core.setFilter(`${sell}-${buy}`)
  @@ -41,41 +36,29 @@ export default class Home extends Component {
  }
  handleBuyCurrencySelect = ({ value }) => {
  - let { sellCurrency, buyCurrency } = this.state
  -
  - if (value === sellCurrency) {
  - sellCurrency = buyCurrency
  - }
  + const { sellCurrency, buyCurrency } = this.state
  this.setState({
  buyCurrency: value,
  - sellCurrency,
  + sellCurrency: value === buyCurrency ? buyCurrency : sellCurrency,
  })
  }
  handleSellCurrencySelect = ({ value }) => {
  - let { sellCurrency, buyCurrency } = this.state
  -
  - if (value === buyCurrency) {
  - buyCurrency = sellCurrency
  - }
  + const { sellCurrency, buyCurrency } = this.state
  this.setState({
  - buyCurrency,
  + buyCurrency: value === buyCurrency ? sellCurrency : buyCurrency,
  sellCurrency: value,
  })
  }
  flipCurrency = () => {
  - let { buyCurrency, sellCurrency } = this.state
  - const value = sellCurrency
  -
  - sellCurrency = buyCurrency
  - buyCurrency = value
  + const { buyCurrency, sellCurrency } = this.state
  this.setState({
  - buyCurrency,
  - sellCurrency,
  + buyCurrency: sellCurrency,
  + sellCurrency: buyCurrency,
  })
  }
  