release: v0.3.9

Steps.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
  s.name = 'Steps'
- s.version = '0.3.8'
+ s.version = '0.3.9'
  s.summary = 'Steps is a navigation bar that guides users through the steps of a task.'
  s.description = <<-DESC
 Steps is a navigation bar that guides users through the steps of a task. You need to use it when a given task is complicated or has a certain sequence in the series of subtasks, we can decompose it into several steps to make things easier.