3.1.1

• Fixes a bug where the srcset of images in imported content was missing or broken (issue #263).
• Improved calculation of ratio difference for images to be included in the srcset. (issue #260).
• Fixes a bug where img tags without ending slash don't get responsive images (issue #259).
• Deprecates the helper function tevkori_get_media_embedded_in_content() which is no longer used.
• Makes sure that the setup of default themes doesn't break the tests (issue #261).
• Adds more examples to the Hook Reference in readme.md.
• Corrections and improvements to inline documentation.