Method in package private class does not need to be public

Author: britter

src/main/java/org/apache/commons/csv/Assertions.java

@@ -30,7 +30,7 @@ private Assertions() {
         // can not be instantiated
     }
 
-    public static void notNull(final Object parameter, final String parameterName) {
+    static void notNull(final Object parameter, final String parameterName) {
         if (parameter == null) {
             throw new IllegalArgumentException("Parameter '" + parameterName + "' must not be null!");
         }