NoMethodError: undefined method `strip' for ["app/models"]:Array

Gemfile:

gem 'annotate', github: 'ctran/annotate_models', branch: 'develop', require: false

---

stderr output:

$ rake db:migrate
Running via Spring preloader in process 94924
rake aborted!
NoMethodError: undefined method `strip' for ["app/models"]:Array
-e:1:in `<main>'
Tasks: TOP => annotate_models
(See full trace by running task with --trace)

---

workaround: modify lib/annotate/annotate_models.rb#L747

    def split_model_dir(option_value)
      option_value = option_value.is_a?(Array) ? option_value : option_value.split(',')
      option_value.map(&:strip).reject(&:empty?)
    end

steps to reproduce:

# create a new project, use Rails 5.1.4
$ rails new  annotate_models_test

# add `gem 'annotate', github: 'ctran/annotate_models', branch: 'develop', require: false` to your Gemfile
$ vim Gemfile

# Run annotate
$ bundle exec annotate