Add support for Applebot

ua.go

@@ -51,6 +51,7 @@ const (
 	Googlebot           = "Googlebot"
 	Twitterbot          = "Twitterbot"
 	FacebookExternalHit = "facebookexternalhit"
+	Applebot            = "Applebot"
 )
 
 // Parse user agent string returning UserAgent struct
@@ -128,6 +129,13 @@ func Parse(userAgent string) UserAgent {
 		ua.Bot = true
 		ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
 
+	case tokens.exists("Applebot"):
+		ua.Name = Applebot
+		ua.Version = tokens[Applebot]
+		ua.Bot = true
+		ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
+		ua.OS = ""
+
 	case tokens["Opera Mini"] != "":
 		ua.Name = OperaMini
 		ua.Version = tokens[OperaMini]

ua_test.go

@@ -61,7 +61,8 @@ func TestParse(t *testing.T) {
 		// Bots
 		{"Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.96 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)", ua.Googlebot, "2.1", "mobile", "Android"},
 		{"Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)", ua.Googlebot, "2.1", "bot", ""},
-		{"Twitterbot/1.0", ua.Twitterbot, "1.0", "bot", ""},
+		{"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15 (Applebot/0.1; +http://www.apple.com/go/applebot)", "Applebot", "0.1", "bot", ""},
+		{"Twitterbot/1.0", ua.Twitterbot, "1.0", ua.Applebot, ""},
 		{"facebookexternalhit/1.1", ua.FacebookExternalHit, "1.1", "bot", ""},
 
 		// other