v0.3.1

1. Add 'check for new versions' feature.
2. Fixed broken (was it broken?) error pop-up window.

src/main/java/nsusbloader/ModelControllers/UpdatesChecker.java

@@ -0,0 +1,63 @@
+package nsusbloader.ModelControllers;
+
+import javafx.concurrent.Task;
+import nsusbloader.NSLMain;
+
+import javax.net.ssl.HttpsURLConnection;
+import java.io.*;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+
+
+public class UpdatesChecker extends Task<List<String>> {
+    @Override
+    protected List<String> call() {
+        String respondedJson;
+        try {
+            URL gitHubUrl = new URL("https://api.github.com/repos/developersu/ns-usbloader/releases/latest");
+            HttpsURLConnection connection = (HttpsURLConnection) gitHubUrl.openConnection();
+            connection.setRequestMethod("GET");
+            connection.setRequestProperty("Accept", "application/vnd.github.v3+json");
+            connection.setConnectTimeout(5000);
+            connection.setReadTimeout(5000);
+
+            int status = connection.getResponseCode();
+            if (status != 200) {
+                return null;
+            }
+            BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
+            respondedJson = br.readLine();
+            br.close();
+            connection.disconnect();
+
+            if (respondedJson == null)
+                return null;
+        }
+        catch (IOException mue){
+            return null;
+        }
+
+        String newVersion = respondedJson.replaceAll("(^.*\"tag_name\":\")(.?|.+?)(\".+$)", "$2");
+        String changeLog = respondedJson.replaceAll("(^.*\"body\":\")(.?|.+?)(\".+$)", "$2")
+                .replaceAll("\\\\r\\\\n","\n")
+                .replaceAll("#+?\\s", "");      // replace #### dsds | # dsds
+
+        if (newVersion.matches("^v(([0-9])+?\\.)+[0-9]+(-.+)$"))                // if new version have postfix like v0.1-Experimental
+            newVersion = newVersion.replaceAll("(-.*$)", "");       // cut postfix
+
+        if ( ! newVersion.matches("^v(([0-9])+?\\.)+[0-9]+$")) {                    // check if new version structure valid
+            return null;
+        }
+
+        List<String> returningValue = new ArrayList<>();
+        if (!newVersion.equals(NSLMain.appVersion)) {                     //  if latest noted version in GitHub is different to this version
+            returningValue.add(newVersion);
+            returningValue.add(changeLog);
+            return returningValue;
+        }
+        returningValue.add("");
+        returningValue.add("");
+        return returningValue;
+    }
+}