Use more consistent geth_poa_middleware name

Author: carver

docs/middleware.rst

@@ -331,16 +331,16 @@ For example, to connect to a local ``geth --dev`` instance on Linux:
     # connect to the default geth --dev IPC location
     >>> w3 = Web3(IPCProvider('/tmp/geth.ipc'))
 
-    >>> from web3.middleware import geth_poa_compatibility
+    >>> from web3.middleware import geth_poa_middleware
 
     # inject the poa compatibility middleware to the innermost layer
-    >>> w3.middleware_stack.inject(geth_poa_compatibility, layer=0)
+    >>> w3.middleware_stack.inject(geth_poa_middleware, layer=0)
 
     # confirm that the connection succeeded
     >>> w3.version.node
     'Geth/v1.7.3-stable-4bb3c89d/linux-amd64/go1.9'
 
-Why is ``geth_poa_compatibility`` necessary?
+Why is ``geth_poa_middleware`` necessary?
 ''''''''''''''''''''''''''''''''''''''''''''''''''''''''
 
 There is no strong community consensus on a single Proof-of-Authority (PoA) standard yet.

tests/core/eth-module/test_poa.py

@@ -2,7 +2,7 @@
 
 from web3.middleware import (
     construct_fixture_middleware,
-    geth_poa_compatibility,
+    geth_poa_middleware,
 )
 
 
@@ -29,7 +29,7 @@ def test_geth_proof_of_authority(web3):
     return_block_with_long_extra_data = construct_fixture_middleware({
         'eth_getBlockByNumber': {'extraData': '0x' + 'ff' * 33},
     })
-    web3.middleware_stack.inject(geth_poa_compatibility, layer=0)
+    web3.middleware_stack.inject(geth_poa_middleware, layer=0)
     web3.middleware_stack.inject(return_block_with_long_extra_data, layer=0)
     block = web3.eth.getBlock('latest')
     assert 'extraData' not in block

web3/middleware/__init__.py

@@ -43,7 +43,7 @@
 )
 
 from .geth_poa import (  # noqa: F401
-    geth_poa_compatibility,
+    geth_poa_middleware,
 )
 
 from .validation import (  # noqa: F401

web3/middleware/geth_poa.py

@@ -23,7 +23,7 @@
 
 geth_poa_cleanup = compose(pythonic_geth_poa, remap_geth_poa_fields)
 
-geth_poa_compatibility = construct_formatting_middleware(
+geth_poa_middleware = construct_formatting_middleware(
     result_formatters={
         'eth_getBlockByHash': geth_poa_cleanup,
         'eth_getBlockByNumber': geth_poa_cleanup,