Tox fixes.

Author: Nurdok

src/pydocstyle/tests/parser_test.py

@@ -2,7 +2,7 @@
 
 import six
 import textwrap
-from pydocstyle.parser import Parser
+from ..parser import Parser
 
 
 class CodeSnippet(six.StringIO):

src/pydocstyle/tests/test_integration.py

@@ -16,7 +16,7 @@
 import textwrap
 import subprocess
 
-from pydocstyle import checker, violations
+from .. import checker, violations
 
 
 __all__ = ()