v2.12 Release

Changelog

• Added monitoring attribute to Create droplet #70 @jeevatkm
• Fixed bug - Not able to get Image (Snapshot) Size #68 @jeevatkm
• Added new endpoint support /v2/certificates/* #71 @jeevatkm
  • Certificates

       Certificates getAvailableCertificates(Integer pageNo, Integer perPage)
       Certificate createCertificate(Certificate certificate)
       Certificate getCertificateInfo(String certificateId)
       Delete deleteCertificate(String certificateId)