Show update button in Explore menu when installed version is not the latest

app/src/main/java/xyz/quaver/pupil/ui/SourceSelector.kt

@@ -260,6 +260,16 @@ fun Explore() {
                         sourceInfo.version
                     ) {
                         DownloadApkAction(actionState) {
+                            if (localSources[sourceInfo.name]?.version != sourceInfo.version) {
+                                TextButton(onClick = {
+                                    coroutineScope.launch {
+                                        val file = actionState.download(sourceInfo)
+                                        context.launchApkInstaller(file)
+                                    }
+                                }) {
+                                    Text("UPDATE")
+                                }
+                            } else {
                                 IconButton(onClick = {
                                     if (sourceInfo.name in localSources) {
                                         context.startActivity(
@@ -285,6 +295,7 @@ fun Explore() {
                 }
             }
     }
+}
 
 @Composable
 fun SourceSelector(onSource: (SourceEntry) -> Unit) {