```bash
$rake version:bump:minor build install
Current version: 0.8.7
Updated version: 0.9.0
  Successfully built RubyGem
  Name: js-routes
  Version: 0.9.0
  File: js-routes-0.9.0.gem
/Users/leo/.rvm/gems/ruby-2.0.0-p0/gems/jeweler-1.6.4/lib/jeweler/commands/install_gem.rb:20:in `gem_command': Use RbConfig instead of obsolete and deprecated Config.
/Users/leo/.rvm/gems/ruby-2.0.0-p0/gems/jeweler-1.6.4/lib/jeweler/commands/install_gem.rb:20:in `gem_command': Use RbConfig instead of obsolete and deprecated Config.
Executing "ruby -S gem install ./pkg/js-routes-0.9.0.gem":
ruby -S gem install ./pkg/js-routes-0.9.0.gem
Successfully installed js-routes-0.9.0
1 gem installed
```