fix jar filter

Author: RedLime

README.md

@@ -0,0 +1,2 @@
+# ModCheck
+![ModCheck](https://cdn.7tv.app/emote/60eefb20119bd109472f7f4b/4x)

src/main/java/com/pistacium/modcheck/ModCheckFrame.java

@@ -109,8 +109,9 @@ private void initBottomLayout() {
                 File[] modFiles = instanceDir.listFiles();
                 if (modFiles == null) return;
                 for (File file : modFiles) {
-                    //noinspection ResultOfMethodCallIgnored
-                    file.delete();
+                    if (file.getName().endsWith(".jar"))
+                        //noinspection ResultOfMethodCallIgnored
+                        file.delete();
                 }
             }