v0.15.0

Commits

• b73e890: Bump Microsoft.NET.Test.Sdk from 17.7.2 to 17.8.0 (dependabot[bot]) #54
• 7fef4a0: Bump AngleSharp from 1.0.5 to 1.0.6 (dependabot[bot]) #55
• 4074c0d: Bump xunit from 2.5.3 to 2.6.1 (dependabot[bot]) #53
• cf22668: Prevent empty HTML to be extracted (Miguel Domingues)