3.1 Release

The most important part of release 3.1 are the the support of OpenLDAP and OAuth2 (Google and Github providers) authetication.

Adds

• Support of OAuth2 authentication with Google and GitHub providers
• Support for OpenLDAP (RFC 4510) authentication
• Support for node's custom IDs Issue#325
• Exclude document from OCR Issue#598

Fixes

• Getting '500 - Internal Server Error' when patching node tags Issue#326
• papermerge-cli import option --delete without any function Issue#592

The documentation for authentication part is here.