Either require semicolons at the end of enum declarations, or don't

Currently, gjf accepts either:

```java
enum Foo {
BAR,
BAZ;
}
```

or:

```java
enum Foo {
BAR,
BAZ
}
```

I had a code reviewer tell me to remove the semicolon. I really do not care one way or another, but I would rather not have to discuss it during code reviews. This is exactly what gjf is for, so it'd be nice to take a stand one way or the other.