v2.0.0

• ADD - Add Source Link support
• ADD - Targeting best practices. Remove target .NET 4.8 and add target .NET 4.6.1
• ADD - Improved docs (readme)
• CHANGE - Factory methods like Ok(..) or Fail(..) are moved to Result class.
• CHANGE - Factory methods on Results class like Results.Ok(..) and Results.Fail(..) are deprecated.
• CHANGE - Result constructors are not public anymore. Use factory methods of Result instead (e.g. Result.Ok(..) or Result.Fail(..))
• CHANGE - Method HasMetadata(...) with expression #40
• FIX - Add version correct in Version property #36