Fix UI styles (#57)

Fix UI styles

src/__tests__/__snapshots__/App.spec.js.snap

@@ -16,7 +16,7 @@ exports[`renders without crashing 1`] = `
         >
           <img
             alt="React Native upgrade helper logo"
-            class="sc-kkGfuU kCopwy"
+            class="sc-kkGfuU hnQnKK"
             src="logo.svg"
             title="React Native upgrade helper logo"
           />
@@ -101,7 +101,7 @@ exports[`renders without crashing 1`] = `
             class="sc-bdVaJa UoSJW"
           >
             <h4>
-              To which version would you like to update?
+              To which version would you like to upgrade?
             </h4>
             <div
               class="ant-select-lg sc-ifAKCX dTveGH sc-bwzfXH jwfMIB ant-select ant-select-enabled ant-select-loading"

src/components/common/Loading.js

@@ -1,6 +1,6 @@
 import React from 'react'
 import styled, { keyframes } from 'styled-components'
-import logo from '../../logo.svg'
+import logo from '../../assets/loading.svg'
 
 const rotate = keyframes`
   from {

src/components/common/VersionSelector.js

@@ -246,7 +246,7 @@ const VersionSelector = ({ showDiff }) => {
         />
 
         <ToVersionSelector
-          title="To which version would you like to update?"
+          title="To which version would you like to upgrade?"
           loading={isLoading}
           value={localToVersion}
           options={toVersionList}

src/components/pages/Home.js

@@ -6,7 +6,7 @@ import ReactGA from 'react-ga'
 import VersionSelector from '../common/VersionSelector'
 import DiffViewer from '../common/DiffViewer'
 import { homepage } from '../../../package.json'
-import logo from '../../logo.svg'
+import logo from '../../assets/logo.svg'
 
 const Page = styled.div`
   display: flex;
@@ -28,6 +28,7 @@ const TitleContainer = styled.div`
 
 const LogoImg = styled.img`
   width: 100px;
+  margin-bottom: 15px;
 `
 
 const TitleHeader = styled.h1`