Add Yandex browser

Author: kshvakov

all_test.go

@@ -333,6 +333,19 @@ var uastrings = []struct {
 		expected: "Platform:Windows OS:Windows 7 Localization:en Browser:Opera-9.80 Engine:Presto-2.9.168 Bot:false Mobile:false",
 	},
 
+	// Yandex Browser
+	{
+		title:      "YandexBrowserLinux",
+		ua:         "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.99 YaBrowser/19.1.0.2494 (beta) Yowser/2.5 Safari/537.36",
+		expected:   "Mozilla:5.0 Platform:X11 OS:Linux x86_64 Browser:YaBrowser-19.1.0.2494 Engine:AppleWebKit-537.36 Bot:false Mobile:false",
+		expectedOS: &OSInfo{"Linux x86_64", "Linux", ""},
+	},
+
+	{
+		title:    "YandexBrowserWindows",
+		ua:       "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 YaBrowser/17.3.1.840 Yowser/2.5 Safari/537.36",
+		expected: "Mozilla:5.0 Platform:Windows OS:Windows 7 Browser:YaBrowser-17.3.1.840 Engine:AppleWebKit-537.36 Bot:false Mobile:false",
+	},
 	// Other
 	{
 		title:    "Empty",

browser.go

@@ -69,14 +69,19 @@ func (p *UserAgent) detectBrowser(sections []section) {
 					p.browser.Name = "Opera"
 					p.browser.Version = sections[slen-1].version
 				default:
-					if sections[sectionIndex].name == "Chrome" {
-						p.browser.Name = "Chrome"
-					} else if sections[sectionIndex].name == "Chromium" {
-						p.browser.Name = "Chromium"
-					} else if sections[sectionIndex].name == "CriOS" {
-						p.browser.Name = "Chrome"
-					} else {
-						p.browser.Name = "Safari"
+					switch sections[slen-3].name {
+					case "YaBrowser":
+						p.browser.Name = "YaBrowser"
+						p.browser.Version = sections[slen-3].version
+					default:
+						switch sections[sectionIndex].name {
+						case "Chrome", "CriOS":
+							p.browser.Name = "Chrome"
+						case "Chromium":
+							p.browser.Name = "Chromium"
+						default:
+							p.browser.Name = "Safari"
+						}
 					}
 				}
 			} else if engine.name == "Gecko" {