[Xamarin.Android.Tools.AndroidSdk] Add API-29, API-30 to KnownVersions (#89)

Author: jonathanpeppers

src/Xamarin.Android.Tools.AndroidSdk/AndroidVersions.cs

@@ -176,6 +176,12 @@ static bool MatchesId (AndroidVersion version, string id)
 			new AndroidVersion (28, "9.0",   "Pie") {
 				AlternateIds = new[]{ "P" },
 			},
+			new AndroidVersion (29, "10.0",  "Android10") {
+				AlternateIds = new[]{ "Q" },
+			},
+			new AndroidVersion (30, "11.0") {
+				AlternateIds = new[]{ "R" },
+			},
 		};
 	}