Remove unused middleware

newsfragments/2015.misc.rst

@@ -0,0 +1 @@
+Remove unused normalize_errors_middleware

web3/manager.py

@@ -34,7 +34,6 @@
     buffered_gas_estimate_middleware,
     gas_price_strategy_middleware,
     name_to_address_middleware,
-    normalize_errors_middleware,
     pythonic_middleware,
     request_parameter_normalizer,
     validation_middleware,
@@ -116,7 +115,6 @@ def default_middlewares(
             (name_to_address_middleware(web3), 'name_to_address'),  # Add Async
             (attrdict_middleware, 'attrdict'),  # Delete
             (pythonic_middleware, 'pythonic'),  # Delete
-            (normalize_errors_middleware, 'normalize_errors'),  # Add async
             (validation_middleware, 'validation'),  # Add async
             (abi_middleware, 'abi'),  # Delete
             (buffered_gas_estimate_middleware, 'gas_estimate'),

web3/middleware/__init__.py

@@ -56,9 +56,6 @@
 from .names import (  # noqa: F401
     name_to_address_middleware,
 )
-from .normalize_errors import (  # noqa: F401
-    normalize_errors_middleware,
-)
 from .normalize_request_parameters import (  # noqa: F401
     request_parameter_normalizer,
 )