Make User-Agent of the form: Evergreen/1.0d28 (Macintosh; RSS Reader; ranchero.com/evergreen/)

The idea is that anyone looking at their stats can quickly find out what it is. It’s a Mac RSS reader. They can open that URL for even more info. (Before 1.0 ships, at that link will be a link to an article for publishers about RSS readers and lowering bandwidth use. Will talk about conditional GET, etc.)

Evergreen/Info.plist

@@ -32,6 +32,8 @@
 	<string>https://ranchero.com/downloads/evergreen-beta.xml</string>
 	<key>UserAgent</key>
 	<string>Evergreen</string>
+	<key>UserAgentParentheticalAddition</key>
+	<string>Macintosh; RSS Reader; ranchero.com/evergreen/</string>
 	<key>NSAppTransportSecurity</key>
 	<dict>
 		<key>NSAllowsArbitraryLoads</key>

Frameworks/RSWeb/RSWeb/UserAgent.swift

@@ -19,6 +19,10 @@ public struct UserAgent {
 			return nil
 		}
 
+		if let userAgentParentheticalAddition = Bundle.main.object(forInfoDictionaryKey: "UserAgentParentheticalAddition") {
+			return "\(userAgentName)/\(version) (\(userAgentParentheticalAddition))"
+		}
+
 		#if os(macOS)
 			let osString = "Macintosh"
 		#elseif os(iOS)