Added the Reykjavík chapter to README.md
Soft typing by Robert Cartwright and Mike Fagan

This paper from 1991 introduces an approach for runtime type checking and type
coercion. It is relevant because this approach is being considered for addition
into Ruby 3.0.

This paper will be discussed at PWL Berlin.
Merge pull request #246 from igorw/soft-typing

Soft typing by Robert Cartwright and Mike Fagan
updated coc
changes subtitle
added fork note
Auctions and bidding: A guide for computer scientists, by Simon Parsons.
Merge pull request #247 from dblock/auctions-and-bidding

Auctions and bidding: A guide for computer scientists, by Simon Parsons.
added IRC channel
added links
added @zeeshanlakhani\'s edits
Updated the URL for the PWL CO site.
Merge pull request #249 from johnclaus/update-pwlco

Updated the URL for the PWL CO site.
zeeshan misspells again :trollface:
Merge pull request #248 from DarrenN/coc-edits

Updates to Code of Conduct
Add a new link

Add link to "f4: Facebook’s Warm BLOB Storage System"
Merge pull request #251 from zhoutai/patch-1

Add a new link
Merge remote-tracking branch 'ppl/master' into patch-1

Conflicts:
	README.md
Merge pull request #210 from sveinnfannar/patch-1

Added the Reykjavík chapter to README.md
Added the Vienna chapter