[BUG] Fix newline issues in remapped text files

gradle.properties

@@ -1,2 +1,2 @@
 version_base=1.0
-version_patch=3
+version_patch=4

src/main/java/com/hypherionmc/modfusioner/actions/JarMergeAction.java

@@ -419,6 +419,9 @@ public class JarMergeAction {
                     line = line.replace(entry.getKey(), entry.getValue());
                 }
                 sb.append(line);
+
+                if (scanner.hasNext())
+                    sb.append("\n");
             }
 
             scanner.close();