fix DRF at 3.0.5, to avoid PaginationSerializer error
fix DRF at 3.0.5, to avoid PaginationSerializer error

zimmerman-zimmerman/OIPA,bryanph/OIPA,openaid-IATI/OIPA,bryanph/OIPA,openaid-IATI/OIPA,zimmerman-zimmerman/OIPA,bryanph/OIPA,openaid-IATI/OIPA,zimmerman-zimmerman/OIPA,zimmerman-zimmerman/OIPA,bryanph/OIPA,openaid-IATI/OIPA,openaid-IATI/OIPA,zimmerman-zimmerman/OIPA