anchor.diff:          | MonoAndroidVersion.V7    -> "v7.0"
           | MonoAndroidVersion.V7_1   -> "v7.1"
           | MonoAndroidVersion.V8   -> "v8.0"
  +        | MonoAndroidVersion.V8_1   -> "v8.1"
   
       static member TryParse s =
           match s with
  
positive.code:         | MonoAndroid MonoAndroidVersion.V7 -> [ MonoAndroid MonoAndroidVersion.V6; DotNetStandard DotNetStandardVersion.V1_6 ]
          | MonoAndroid MonoAndroidVersion.V7_1 -> [ MonoAndroid MonoAndroidVersion.V7 ]
          | MonoAndroid MonoAndroidVersion.V8 -> [ MonoAndroid MonoAndroidVersion.V7_1 ]
          | MonoTouch -> [ DotNetStandard DotNetStandardVersion.V1_6 ]
          | MonoMac -> [ DotNetStandard DotNetStandardVersion.V1_6 ]
          | Native(_) -> [ ]
  
negative.code:     | V7
      | V7_1
      | V8
      | V8_1
      member this.ShortString() =
          match this with
          | MonoAndroidVersion.V1    -> ""
  