require 'lob' does not work

[siannopollo]

The documentation states that to get started one need only run:

gem install 'lob'
require 'lob'

This no longer seems to work after the 6.0.0 release, as there is no longer a lib/lob.rb file to require. I'm using rails 5.2.8.1, ruby 2.6.5p114 and trying to load lob looks something like this:

$ rails c
Loading development environment (Rails 5.2.8.1)
2.6.5 :001 > require 'lob'
Traceback (most recent call last):
        1: from (irb):1
LoadError (cannot load such file -- lob)
2.6.5 :002 > Lob
Traceback (most recent call last):
        2: from (irb):2
        1: from (irb):2:in `rescue in irb_binding'
NameError (uninitialized constant Lob)
2.6.5 :003 > require 'openapi_client'
 => true 
2.6.5 :004 > Lob

This could probably be solved by adding lib/lob.rb back to the project and making that require 'openapi_client'.

[BennyKitchell]

Hey @siannopollo

Great catch on this, your PR has been merged and I have released a new version. Definitely let me know if anything else stands out as a problem.