Update changelog for 3.0.0 release
Update changelog for 3.0.0 release

Signed-off-by: Seth Thomas <70057f453423577300910f8d731f9c9b27b0f2fb@chef.io>

opscode-cookbooks/openldap,HomesiteInsurance/openldap,HomesiteInsurance/openldap,chef-cookbooks/openldap,opscode-cookbooks/openldap,chef-cookbooks/openldap