thunder: fix RuboCop style.

See https://github.com/Homebrew/brew/pull/7867.

Casks/thunder.rb

@@ -1,29 +1,29 @@
-cask 'thunder' do
-  version '3.4.1.4368'
-  sha256 'a732b748d95005fbf7ecfe3373be037940b10127dc1adf3de30a4a05d46a97f2'
+cask "thunder" do
+  version "3.4.1.4368"
+  sha256 "a732b748d95005fbf7ecfe3373be037940b10127dc1adf3de30a4a05d46a97f2"
 
   # down.sandai.net/ was verified as official when first introduced to the cask
   url "https://down.sandai.net/mac/thunder_#{version}.dmg"
-  appcast 'https://static-xl9-ssl.xunlei.com/json/mac_download_url.json'
-  name 'Thunder'
-  name '迅雷'
-  homepage 'https://www.xunlei.com/'
+  appcast "https://static-xl9-ssl.xunlei.com/json/mac_download_url.json"
+  name "Thunder"
+  name "迅雷"
+  homepage "https://www.xunlei.com/"
 
   auto_updates true
-  depends_on macos: '>= :yosemite'
+  depends_on macos: ">= :yosemite"
 
-  app 'Thunder.app'
+  app "Thunder.app"
 
   zap trash: [
-               '~/Library/Application Support/Thunder',
-               '~/Library/Caches/com.xunlei.Thunder',
-               '~/Library/Caches/com.xunlei.XLPlayer',
-               '~/Library/Cookies/com.xunlei.Thunder.binarycookies',
-               '~/Library/Preferences/com.xunlei.Thunder.loginSDK.plist',
-               '~/Library/Preferences/com.xunlei.Thunder.plist',
-               '~/Library/Preferences/com.xunlei.XLPlayer.plist',
-               '~/Library/Saved Application State/com.xunlei.Thunder.savedState',
-               '~/Library/Saved Application State/com.xunlei.XLPlayer.savedState',
-               '~/Library/WebKit/com.xunlei.Thunder',
-             ]
+    "~/Library/Application Support/Thunder",
+    "~/Library/Caches/com.xunlei.Thunder",
+    "~/Library/Caches/com.xunlei.XLPlayer",
+    "~/Library/Cookies/com.xunlei.Thunder.binarycookies",
+    "~/Library/Preferences/com.xunlei.Thunder.loginSDK.plist",
+    "~/Library/Preferences/com.xunlei.Thunder.plist",
+    "~/Library/Preferences/com.xunlei.XLPlayer.plist",
+    "~/Library/Saved Application State/com.xunlei.Thunder.savedState",
+    "~/Library/Saved Application State/com.xunlei.XLPlayer.savedState",
+    "~/Library/WebKit/com.xunlei.Thunder",
+  ]
 end