Backport - Fix #730 - Improve browser detection: DuckDuckGo

(cherry picked from commit e87c794)

Author: faisalman

src/ua-parser.js

@@ -243,6 +243,8 @@
             /(heytap|ovi)browser\/([\d\.]+)/i,                                  // Heytap/Ovi
             /(weibo)__([\d\.]+)/i                                               // Weibo
             ], [NAME, VERSION], [
+            /\bddg\/([\w\.]+)/i                                                 // DuckDuckGo
+            ], [VERSION, [NAME, 'DuckDuckGo']], [
             /(?:\buc? ?browser|(?:juc.+)ucweb)[\/ ]?([\w\.]+)/i                 // UCBrowser
             ], [VERSION, [NAME, 'UC'+BROWSER]], [
             /microm.+\bqbcore\/([\w\.]+)/i,                                     // WeChat Desktop for Windows Built-in Browser

test/browser-test.json

@@ -419,6 +419,16 @@
             "major"   : "1"
         }
     },
+    {
+        "desc"    : "DuckDuckGo",
+        "ua"      : "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4.1 Safari/605.1.1517.4.1 Ddg/17.4.1",
+        "expect"  :
+        {
+            "name"    : "DuckDuckGo",
+            "version" : "17.4.1",
+            "major"   : "17"
+        }
+    },
     {
         "desc"    : "DuckDuckGo",
         "ua"      : "Mozilla/5.0 (Linux; Android 8.1.0) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/92.0.4515.131 Mobile DuckDuckGo/5 Safari/537.36",