rake spec:portability is not working

[agrberg]

I just cloned the project and am on the current master branch. I ran bundle to get setup and then rake spec:portability but received the following error

rake aborted!
Don't know how to build task 'spec:portability' (see --tasks)
/Users/agrberg/.rvm/gems/ruby-2.3.1/gems/rake-11.2.2/exe/rake:27:in `<top (required)>'
/Users/agrberg/.rvm/gems/ruby-2.3.1/bin/ruby_executable_hooks:15:in `eval'
/Users/agrberg/.rvm/gems/ruby-2.3.1/bin/ruby_executable_hooks:15:in `<main>'
(See full trace by running task with --trace)

Currently on ruby 2.3.1p112
Gem 2.5.1
Bundler 1.13.1

Let me know if I can provide any more information.

[e2]

I renamed the task at some point, but forgot to updated the docs:
https://github.com/guard/guard-rspec/blob/c408d93/Rakefile#L21