Fixes missing closing ins tag

🐞 fixes #20 and #61
⬆️ test dependencies updated

Fixes issue with text decoration

Added support for span tag when detecting text decoration changes. See #59

Addresses issue with custom block matchers

• Minor changes to build configuration
• Fixes issue where custom block expressions weren't working correctly (See #55 )

https://www.nuget.org/packages/htmldiff.net/1.4.1