Enforce braces around conditionals

Wanted to get thoughts on prettier enforcing braces around conditionals (example below). I believe prettier-js has shot down this request in the past on the grounds that they don't want to modify the AST, but I'm not sure if prettier-java has already crossed that bridge. It would probably be a controversial decision and is maybe a slippery slope, but I think it's pretty well-established at this point that using braces around conditionals is a best practice for correctness and maintainability, so I think it would be reasonable for prettier-java to enforce it.

**Prettier-Java 1.0.2*

```sh
# Options (if any):
--print-width 80
```

**Input:**

```java
public class Test {

public void method() {
if (true) System.out.println("hi");
}
}
```

**Output:**

```java
public class Test {

public void method() {
if (true) System.out.println("hi");
}
}
```

**Expected behavior:**

```java
public class Test {

public void method() {
if (true) {
System.out.println("hi");
}
}
}
```