Update README.md

the field extra-source-files needs a wildcard with extension
Merge pull request #17 from tkvogt/patch-1

Update README.md
diagrams-haddock should work with both 0.6 and 0.7
Merge branch 'master' of github.com:diagrams/diagrams-haddock
update contributors [ci skip]
add 0.1.1.0 to CHANGES
Merge branch 'master' into dia-haddock-0.1