Redirect to /swap and add (estimated) to last edit (#40)

src/pages/App.js

 import React, { Component } from 'react';
 import { drizzleConnect } from 'drizzle-react'
-import { BrowserRouter, Switch, Route } from 'react-router-dom';
+import { BrowserRouter, Switch, Redirect, Route } from 'react-router-dom';
 import { AnimatedSwitch } from 'react-router-transition';
 import Swap from './Swap';
 import Send from './Send';
@@ -25,7 +25,7 @@ class App extends Component {
           <Route exact path="/swap" component={Swap} />
           <Route exact path="/send" component={Send} />
           <Route exact path="/pool" component={Pool} />
-          <Route component={Swap} />
+          <Redirect exact from="/" to="/swap" />
         </AnimatedSwitch>
       </BrowserRouter>
     );

src/pages/Swap/index.js

@@ -143,10 +143,11 @@ class Swap extends Component {
   }
 
   render() {
-    const { inputCurrency, outputCurrency, input, output } = this.props;
+    const { lastEditedField, inputCurrency, outputCurrency, input, output } = this.props;
     const { exchangeRate } = this.state;
     const inputLabel = this.getTokenLabel(inputCurrency);
     const outputLabel = this.getTokenLabel(outputCurrency);
+    const estimatedText = '(estimated)'
 
     return (
       <div className="swap">
@@ -158,6 +159,7 @@ class Swap extends Component {
         >
           <CurrencyInputPanel
             title="Input"
+            description={lastEditedField === 'output' ? estimatedText : ''}
             onCurrencySelected={d => this.props.updateField('inputCurrency', d)}
             onValueChange={d => this.updateInput(d)}
             selectedTokens={[inputCurrency, outputCurrency]}
@@ -170,7 +172,7 @@ class Swap extends Component {
           </OversizedPanel>
           <CurrencyInputPanel
             title="Output"
-            description="(estimated)"
+            description={lastEditedField === 'input' ? estimatedText : ''}
             onCurrencySelected={d => this.props.updateField('outputCurrency', d)}
             onValueChange={d => this.updateOutput(d)}
             selectedTokens={[inputCurrency, outputCurrency]}