Missing empty line after copyright section

https://google.github.io/styleguide/javaguide.html#s3-source-file-structure says

> A source file consists of, in order:
>
> 1. License or copyright information, if present
> 2. Package statement
> 3. Import statements
> 4. Exactly one top-level class
>
> Exactly one blank line separates each section that is present.

But google-java-format does not add the blank line between a License section and a package statement.


閱讀連結的 Google Java Style Guide 中關於原始檔結構的章節，然後重現一個包含版權資訊、後接 package 陳述式的 Java 檔案的格式化程式輸出。當 google-java-format 在這兩個部分之間插入恰好一個空白行時，即表示完成。

由索引模型根據 Issue 內容生成。