Paper2remarkable Release 0.9.13

* Add DiVA provider (thanks to @koddas)
* Fix various broken providers and unit tests

Paper2remarkable Release v0.9.13 (release candidate 1)

paper2remarkable release v0.9.12

* Bugfix for NeurIPS provider
* Bugfix for IACR provider
* Bugfix for PubMed provider
* Bugfix for `remarkable_dir` argument (GjjvdBurg#131)
* Disable SagePub, ScienceDirect, and Taylor & Francis providers due to
  CloudFlare blocking automated access
* Disable CiteSeerX due to incomplete results when fetching metadata
* Improve instructions in the readme
* Remove `cloudscraper` dependency

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