remove weird unicode space in the new copyright header

The bytes were actually:

    #\xe2\x80\x82Copyright...
Merge pull request #5487 from minrk/unicode-copy-weird

remove weird unicode space in the new copyright header
update mailmap
add what's new for 2.0
last gh-stats update for 2.0
review pass on what's new in 2.0
Merge pull request #5483 from minrk/whatsnew2

Add what's new doc for 2.0
release 2.0.0