title: Trying to generate friendly_id on rails 5
body: <p>I keep getting this msg</p>
  
  <pre><code>$ rails generate friendly_id
  </code></pre>
  
  <blockquote>
    <p>Running via Spring preloader in process 17863 Could not find generator
    'friendly_id'. Maybe you meant 'channel', 'generator' or 'helper' Run
    <code>rails generate --help</code> for more options.</p>
  </blockquote>
  
  <p><strong>Gemfile</strong></p>
  
  <pre><code>source 'https://rubygems.org'
  
  gem 'rails',        '5.0.0.1'
  gem 'puma',         '3.4.0'
  gem 'sass-rails',   '5.0.6'
  gem 'uglifier',     '3.0.0'
  gem 'coffee-rails', '4.2.1'
  gem 'jquery-rails', '4.1.1'
  gem 'turbolinks',   '5.0.1'
  gem 'jbuilder',     '2.4.1'
  gem 'friendly_id', '~&gt; 5.1.0' 
  gem 'bootstrap', '~&gt; 4.0.0.alpha5'
  
  group :development, :test do
    gem 'sqlite3', '1.3.11'
    gem 'byebug',  '9.0.0', platform: :mri
  end
  
  group :development do
    gem 'web-console',           '3.1.1'
    gem 'listen',                '3.0.8'
    gem 'spring',                '1.7.2'
    gem 'spring-watcher-listen', '2.0.0'
  end
  
  # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
  
  gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
  </code></pre>