Added _ca_certs property to _SSLAdapter to properly support pickling (broke in SDK v11.33)#440

mover333 merged 2 commits intodropbox:maindropbox/dropbox-sdk-python:mainfrom

dennissiemensma:bug/_ca_certs-pickledennissiemensma/dropbox-sdk-python:bug/_ca_certs-pickleCopy head branch name to clipboard