Added empty lines after guard if-s according to rubocop rules

lib/performify/base.rb

@@ -75,6 +75,7 @@ def fail?
     private def prepare_instance
       define_singleton_method(:execute!) do |&block|
         return if defined?(@result)
+
         super(&block)
       end
 

lib/performify/callbacks.rb

@@ -12,6 +12,7 @@ def register_callback(type_of_callback, method_name = nil, &block)
       unless TYPES_OF_CALLBACK.include?(type_of_callback)
         raise UnknownTypeOfCallbackError, "Type #{type_of_callback} is not allowed"
       end
+
       @service_callbacks ||= {}
       @service_callbacks[type_of_callback] ||= []
       @service_callbacks[type_of_callback] << method_name if method_name
@@ -23,6 +24,7 @@ def execute_callbacks(type_of_callback, instance)
       unless TYPES_OF_CALLBACK.include?(type_of_callback)
         raise UnknownTypeOfCallbackError, "Type #{type_of_callback} is not allowed"
       end
+
       cbs = (@service_callbacks || {}).fetch(type_of_callback, [])
       cbs.each { |cb| cb.is_a?(Proc) ? instance.instance_eval(&cb) : instance.send(cb) }
       nil

lib/performify/validation.rb

@@ -26,6 +26,7 @@ def schema
 
       def validate
         return args if schema.nil?
+
         result = schema.with(with_options).call(args)
         if result.success?
           @inputs = result.output
@@ -37,6 +38,7 @@ def validate
 
       def errors!(new_errors)
         raise ArgumentError, 'Errors should be a hash' if new_errors.nil? || !new_errors.respond_to?(:to_h)
+
         new_errors.to_h.each do |key, value|
           errors[key] = errors.key?(key) ? [errors[key]].flatten(1) + [value].flatten(1) : value
         end