v7.0.0

• Change target profiles to netstandard1.1, netstandard2.0, net5.0, net6.0 (BREAKING)
• Change default fallback behaviour to throw an exception with a report of the match attempts
• Add JSON and XML matchers
• Add support for synchronous HttpClient.Send #104
• Modernize source #41 and add SourceLink support #66
• Fix matching of encoded URL paths #116
• Throw a descriptive error when matching on a mocked request with no response #87 (thanks perfectsquircle!)
• Fix race condition on outstanding requests exception message #96 (thanks jr01!)