fix reversed Result monad (fix #226) (#227)

Author: mikepii

jsonrpcserver/result.py

@@ -31,7 +31,7 @@ def __repr__(self) -> str:
 
 
 # Union of the two valid result types
-Result = Either[SuccessResult, ErrorResult]
+Result = Either[ErrorResult, SuccessResult]
 
 
 # Helpers