v0.8.2: added some basic support for demo and instant app functionality

services/updates/githubUpdates/src/main/java/com/shatteredpixel/shatteredpixeldungeon/services/updates/GitHubUpdates.java

@@ -38,6 +38,11 @@ public class GitHubUpdates extends UpdateService {
 	private static Pattern descPattern = Pattern.compile("(.*?)(\r\n|\n|\r)(\r\n|\n|\r)---", Pattern.DOTALL + Pattern.MULTILINE);
 	private static Pattern versionCodePattern = Pattern.compile("internal version number: ([0-9]*)", Pattern.CASE_INSENSITIVE);
 
+	@Override
+	public boolean isUpdateable() {
+		return true;
+	}
+
 	@Override
 	public void checkForUpdate(boolean useMetered, UpdateResultCallback callback) {
 
@@ -120,4 +125,14 @@ public class GitHubUpdates extends UpdateService {
 		DeviceCompat.openURI( update.URL );
 	}
 
+	@Override
+	public boolean isInstallable() {
+		return false;
+	}
+
+	@Override
+	public void initializeInstall() {
+		//does nothing, always installed
+	}
+
 }