Update django-storages to 1.5.1

[pyup-bot]

There's a new version of django-storages available.
You are currently using 1.4.1. I have updated it to 1.5.1

These links might come in handy: PyPI | Changelog | Repo

Changelog

1.5.1

---

• Drop support for Django 1.7 (185_)
• Deprecate hashpath, image, overwrite, mogile, symlinkorcopy, database, mogile, couchdb.
  See (issue 202_) to discuss maintenance going forward
• Use a fixed mtime argument for GzipFile in S3BotoStorage and S3Boto3Storage to ensure
  a stable output for gzipped files
• Use .putfileobj instead of .put in S3Boto3Storage to use the transfer manager,
  allowing files greater than 5GB to be put on S3 (194_ , 201_)
• Update S3Boto3Storage for Django 1.10 (181_) (get_modified_time and get_accessed_time) thanks JshWright
• Fix bad kwarg name in S3Boto3Storage when AWS_PRELOAD_METADATA is True (189, 190) thanks leonsmith

.. _issue 202: jschneier/django-storages#202
.. _201: jschneier/django-storages#201
.. _194: jschneier/django-storages#194
.. _190: jschneier/django-storages#190
.. _189: jschneier/django-storages#189
.. _185: jschneier/django-storages#185
.. _181: jschneier/django-storages#181

1.5.0

---

• Add new backend S3Boto3Storage (179_) MASSIVE THANKS mbarrien
• Add a strict option to utils.setting (176_) thanks ZuluPro
• Tests, documentation, fixing .close for SFTPStorage (177_) thanks ZuluPro
• Tests, documentation, add .readlines for FTPStorage (175_) thanks ZuluPro
• Tests and documentation for DropBoxStorage (174_) thanks ZuluPro
• Fix MANIFEST.in to not ship .pyc files. (145_) thanks fladi
• Enable CI testing of Python3.5 and fix test failure from api change (171_) thanks tnir

.. _145: jschneier/django-storages#145
.. _171: jschneier/django-storages#171
.. _174: jschneier/django-storages#174
.. _175: jschneier/django-storages#175
.. _177: jschneier/django-storages#177
.. _176: jschneier/django-storages#176
.. _179: jschneier/django-storages#179

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖