Change visibility of field fMethod to private.

There is a getter method for this field. Users should use this method.

Author: stefanbirkner

src/main/java/org/junit/runners/model/FrameworkMethod.java

@@ -19,7 +19,7 @@
  * @since 4.5
  */
 public class FrameworkMethod extends FrameworkMember<FrameworkMethod> {
-    final Method fMethod;
+    private final Method fMethod;
 
     /**
      * Returns a new {@code FrameworkMethod} for {@code method}