ChangeLog: Update for 1.1.1 release.
ChangeLog: Update for 1.1.1 release.

dropbox/dropbox-sdk-php,sayfulit/dropbox-sdk-php,TimeDoctorLLC/dropbox-sdk-php,demisang/dropbox-sdk-php,itsazzad/dropbox-sdk-php,dropbox/dropbox-sdk-php,itsazzad/dropbox-sdk-php,demisang/dropbox-sdk-php,TimeDoctorLLC/dropbox-sdk-php,sayfulit/dropbox-sdk-php