Add token logo fallback

src/components/TokenLogo/index.js

 import React, { Component } from 'react';
 import PropTypes from 'prop-types';
 import EthereumLogo from '../../assets/images/ethereum-logo.png';
+import GenericTokenLogo from '../../assets/images/generic-token-logo.png';
 
 const TOKEN_ICON_API = 'https://raw.githubusercontent.com/TrustWallet/tokens/master/images';
 
@@ -23,7 +24,7 @@ export default class TokenLogo extends Component {
 
   render() {
     const { address, size, className } = this.props;
-    let path = 'https://png2.kisspng.com/sh/59799e422ec61954a8e126f9203cd0b3/L0KzQYm3U8I6N5xniZH0aYP2gLBuTflxcJDzfZ9ubXBteX76gf10fZ9sRdlqbHH7iX7ulfV0e155gNc2cYXog8XwjB50NZR3kdt3Zz3ofbFxib02aZNoetUAYkC6QoXrVr4zP2Y1SKkBNkG4QoO6Ucg1Omg1Sqs8LoDxd1==/kisspng-iphone-emoji-samsung-galaxy-guess-the-questions-crying-emoji-5abcbc5b0724d6.2750076615223184270293.png';
+    let path = GenericTokenLogo;
 
     if (address === 'ETH') {
       path = EthereumLogo;

src/logo.svg

-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
-    <g fill="#61DAFB">
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-        <circle cx="420.9" cy="296.5" r="45.7"/>
-        <path d="M520.5 78.1z"/>
-    </g>
-</svg>