style: fix import order

Author: simschla

lib/src/main/java/com/diffplug/spotless/npm/ListableAdapter.java

@@ -15,13 +15,13 @@
  */
 package com.diffplug.spotless.npm;
 
-import javax.annotation.Nonnull;
-
 import java.util.Arrays;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Objects;
 
+import javax.annotation.Nonnull;
+
 class ListableAdapter<T> implements Iterable<T> {
 
 	private final List<T> delegate;