Update Parameterized.java

Author: panchenko

src/main/java/org/junit/runners/Parameterized.java

@@ -346,7 +346,7 @@ private static class RunnersFactory {
 
         private final TestClass testClass;
         private final FrameworkMethod parametersMethod;
-        private List<Object> allParameters;
+        private final List<Object> allParameters;
         private final int parameterCount;
         private final Runner runnerOverride;