Fixed imports and PEP8 syntax

Author: syrusakbary

graphql/execution/experimental/resolver.py

@@ -18,9 +18,6 @@ def normal_map(func, iter):
     imap = map
 
 
-
-
-
 def is_promise(value):
     return isinstance(value, Promise)
 

graphql/execution/experimental/tests/utils.py

@@ -1,8 +1,9 @@
+from promise import Promise
+
 from graphql.execution import ExecutionResult
 from graphql.language.parser import parse
 from graphql.language.source import Source
 from graphql.validation import validate
-from promise import Promise
 
 from ..executor import execute