seal the class.

Author: SimY4

jetCheck/src/main/java/com/github/simy4/coregex/jetCheck/CoregexGenerator.java

@@ -20,7 +20,7 @@
 import java.util.regex.Pattern;
 import org.jetbrains.jetCheck.Generator;
 
-public class CoregexGenerator {
+public final class CoregexGenerator {
   public static Generator<String> of(String regex) {
     return of(Pattern.compile(regex));
   }
@@ -35,4 +35,6 @@ public static Generator<String> of(Pattern pattern) {
         generationEnvironment ->
             coregex.generate(generationEnvironment.generate(Generator.integers())));
   }
+
+  private CoregexGenerator() {}
 }