DRF 3.10 is cleaning up its code base quite a bit so I suggest we also take the opportunity to clean up DJA as well by planning a major release 3.0.0

Following steps would I see:

• releasing 2.8.0 (notes to be the last release for Python 2.7, 3.4 and DRF <3.9)
• dropping support for Python 2.7 and 3.4 (python 3.4 deprecated #658)
• dropping support for Django Filter 1.1
• dropping support for all DRF versions <3.9
• remove all DJA deprecated code
• solving DRF deprecation issue (like DRF 3.10 deprecated decorators #657 and others)

This version of course will only be released once DRF 3.10 is as well.

@n2ygk What do you think? If we agree on the steps I hope to find some time to work on this (starting with releasing 2.8.0)