New Rule: Parentheses in Macro Definitions

[elbrujohalcon]

Ref: WhatsApp/erlfmt#91

• Omit () in macro names only if they represent constants

%% Bad
-define(NOT_CONSTANT, application:get_env(myapp, key)).
-define(CONSTANT(), 100).

%% Good
-define(NOT_CONSTANT(), application:get_env(myapp, key)).
-define(CONSTANT, 100).