Adds the Adsense bot (mobile) (#46)

Added support for AdsBot Google Mobile's user agents

all_test.go

@@ -89,6 +89,16 @@ var uastrings = []struct {
 		ua:       "Mozilla/5.0 (compatible; AhrefsBot/4.0; +http://ahrefs.com/robot/)",
 		expected: "Mozilla:5.0 Browser:AhrefsBot-4.0 Bot:true Mobile:false",
 	},
+	{
+		title:    "AdsBotGoogle",
+		ua:       "AdsBot-Google (+http://www.google.com/adsbot.html)",
+		expected: "Browser:AdsBot-Google Bot:true Mobile:false",
+	},
+	{
+		title:    "AdsBotGoogleMobile",
+		ua:       "Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1 (compatible; AdsBot-Google-Mobile; +http://www.google.com/mobile/adsbot.html)",
+		expected: "Mozilla:5.0 Browser:AdsBot-Google-Mobile Bot:true Mobile:true",
+	},
 
 	// Internet Explorer
 	{

bot.go

@@ -43,8 +43,9 @@ func getFromSite(comment []string) string {
 // mobile bot. This function also modifies some attributes in the receiver
 // accordingly.
 func (p *UserAgent) googleBot() bool {
-	// This is a hackish way to detect Google's mobile bot.
-	if strings.Index(p.ua, "Googlebot") != -1 {
+	// This is a hackish way to detect Google's mobile bot (Googlebot, AdsBot-Google-Mobile, etc.).
+	// See https://support.google.com/webmasters/answer/1061943
+	if strings.Index(p.ua, "Google") != -1 {
 		p.platform = ""
 		p.undecided = true
 	}