Bump the version number to 2.1.0
Bump the version number to 2.1.0

Since the exported datatype DocName has changed, we need to bump the
major version number.

Let's also drop the fourth version component, it's not that useful.

haskell/haddock,JPMoresmau/haddock,esmolanka/haddock,esmolanka/haddock,Fuuzetsu/haddock,Acidburn0zzz/haddock,niteria/haddock,idontgetoutmuch/haddock,esmolanka/haddock,adamse/haddock,sboosali/haddock,Helkafen/haddock,randen/haddock,sboosali/haddock,Mistuke/haddock,Wizek/haddock,randen/haddock,jgm/haddock,haskell/haddock,mrhania/haddock,jgm/haddock,haskell/haddock,mrhania/haddock,Fuuzetsu/haddock,Acidburn0zzz/haddock,beni55/haddock,lamefun/haddock,haskell/haddock,JPMoresmau/haddock,mrBliss/haddock,niteria/haddock,JPMoresmau/haddock,idontgetoutmuch/haddock,mrBliss/haddock,beni55/haddock,Helkafen/haddock,randen/haddock,haskell/haddock,niteria/haddock,Fuuzetsu/haddock,Acidburn0zzz/haddock,Helkafen/haddock,beni55/haddock,adamse/haddock,Wizek/haddock,Mistuke/haddock,mrhania/haddock,Fuuzetsu/haddock,mrBliss/haddock,lamefun/haddock,adamse/haddock,sboosali/haddock,idontgetoutmuch/haddock,jstolarek/haddock,Wizek/haddock,jstolarek/haddock,Mistuke/haddock,lamefun/haddock