correct indentation after one line definition with if keyword

[tonini]

fixes #212

Before:

defmodule ControlFlow do
  defmacro my_if(expr, do: if_block), do: if(expr, do: if_block, else: nil)
                                          defmacro my_if(expr, do: if_block, else: else_block) do
                                            quote do
                                              case unquote(expr) do
                                                result when result in [false, nil] -> unquote(else_block)
                                                _ -> unquote(if_block)
                                              end
                                            end
                                            end
end

After:

defmodule ControlFlow do
  defmacro my_if(expr, do: if_block), do: if(expr, do: if_block, else: nil)
  defmacro my_if(expr, do: if_block, else: else_block) do
    quote do
      case unquote(expr) do
        result when result in [false, nil] -> unquote(else_block)
        _ -> unquote(if_block)
      end
    end
  end
end

[tonini]

@mattdeboard review please.

@ianrumford Would be great if you could test this one.

[mattdeboard]

These rules are getting quite extensive. We need to start adding comments explaining what these are for.

[ianrumford]

Apologies guys, just seen the notification.

I've tested and it works great now.

Thanks to all for time and effort.