Fix lint

Author: Joachim Jablon

Makefile

@@ -17,7 +17,7 @@ clean-pyc: ## remove Python file artifacts
 	find . -name '*~' -exec rm -f {} +
 
 lint: ## check style with flake8
-	flake8 django_readonly_field tests
+	flake8 --exclude="migrations,.tox,docs,build" .
 
 test: ## run tests quickly with the default Python
 	python runtests.py

django_readonly_field/compiler.py

@@ -1,9 +1,13 @@
 from django.db.models.sql.compiler import SQLCompiler
-from django.db.models.sql.compiler import SQLInsertCompiler as BaseSQLInsertCompiler
+from django.db.models.sql.compiler import SQLInsertCompiler as BaseSQLInsertCompiler  # noqa
 from django.db.models.sql.compiler import SQLDeleteCompiler
-from django.db.models.sql.compiler import SQLUpdateCompiler as BaseSQLUpdateCompiler
+from django.db.models.sql.compiler import SQLUpdateCompiler as BaseSQLUpdateCompiler  # noqa
 from django.db.models.sql.compiler import SQLAggregateCompiler
 
+SQLCompiler = SQLCompiler
+SQLDeleteCompiler = SQLDeleteCompiler
+SQLAggregateCompiler = SQLAggregateCompiler
+
 
 class ReadOnlySQLCompilerMixin(object):