Pyoffers

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Added
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- ``display_attribute`` property to models, that defines what property will be displayed in __str__ representation. (`iamanikeev`_)
- Support for Python 3.7, 3.8 and PyPy3

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Added
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- ``find_all_affiliate_approvals``. (`iamanikeev`_)
- Fix ``find_all_(offer|affiliate|advertiser)_tag_relations`` methods for Tag model. (`iamanikeev`_)

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Added
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- Support of Tag controller. (`iamanikeev`_)

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Added
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- ``generate_tracking_link`` method for ``Offer`` model. (`iamanikeev`_)

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Added
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- ``unblock_affiliate``, ``set_affiliate_approval_status``, ``get_affiliate_approval_status``,
``get_blocked_affiliate_ids``, ``get_approved_affiliate_ids``, ``get_unapproved_affiliate_ids`` methods
for ``Offer`` model. (`iamanikeev`_)

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Fixed
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- Removed internal dependency on ``pip.utils``, which makes the library compatible with pip 10. `70`_ (`butorov`_, `Stranger6667`_)