updated CHANGELOG for v2.0.0
updated CHANGELOG for v2.0.0

jsiembida/bucky3,Hero1378/bucky,trbs/bucky,ewdurbin/bucky,JoseKilo/bucky,dimrozakis/bucky,JoseKilo/bucky,dimrozakis/bucky,ewdurbin/bucky,Hero1378/bucky,trbs/bucky