Update code style

code-style.md

@@ -2,6 +2,7 @@
 * Egyptian brackets
 * Tabs for indentation, tab width of 4
 * `if/else/for/while` may omit brackets if the body fits on a single line
+* If the `if` uses brackets, the `else` should too (and vice versa)
 * `else/catch/finally` continue the same line as the preceding bracket
 * Use `foo` rather than `mFoo`, `_foo`, etc for field names
 * Use `foo` rather than `this.foo` unless there's also a local `foo`