Add update-check http api call to see if client is outdated

http-api/src/main/java/net/runelite/http/api/RuneliteAPI.java

@@ -37,6 +37,7 @@ public class RuneliteAPI
 	private static final String BASE = "https://api.runelite.net/runelite-";
 	private static final Properties properties = new Properties();
 	private static String version;
+	private static int rsVersion;
 
 	static
 	{
@@ -46,6 +47,7 @@ public class RuneliteAPI
 			properties.load(in);
 
 			version = properties.getProperty("runelite.version");
+			rsVersion = Integer.parseInt(properties.getProperty("rs.version"));
 		}
 		catch (IOException ex)
 		{
@@ -68,4 +70,9 @@ public class RuneliteAPI
 		RuneliteAPI.version = version;
 	}
 
+	public static int getRsVersion()
+	{
+		return rsVersion;
+	}
+
 }

http-api/src/main/resources/runelite.properties

@@ -1 +1,2 @@
-runelite.version=${project.version}
+runelite.version=${project.version}
+rs.version=${rs.version}