Autogen update.

Autogen version bump & new corresponding SHA1. No other changes. I couldn't see any PRs relating to autogen's new version in the last couple of months, and the most recent version on here is 5.18.1 so hopefully this is okay to submit.
Autogen.rb

An experiment recommended by Autogen's 'Readme' documentation. Wondering if this solves the issue the bot was having, despite me not being able to reproduce that issue locally. We'll see.
Autogen

Testing the other README suggestion out. Not entirely sure of the syntax here, whether the whole '' within the "" syntax will freak the bot out.
Autogen

More README suggestions.
Autogen

Thanks to @jacknagel for the suggestion here. Hopefully this does the job.
Autogen

Attempts at fixing the bot's issues, part 2784. (*Okay, part 6 or so really*).
Autogen

Experiment to determine if 5.18.2 contains the same guile error as 5.18.3 does, despite 5.18.3 containing a patch that claims to fix the guile issue.
Autogen

Should remove the trailing whitespace at the end of line 10/start of line 11.
autogen: add 5.18.2 bottle.