Fix for flake8

tests/test.py:13:1: E402 module level import not at top of file

Author: yuya-takeyama

tests/test.py

@@ -6,12 +6,10 @@
 import os
 import sys
 import unittest
+import yaml
 
 BASE_PATH = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 sys.path.insert(0, os.path.join(BASE_PATH, 'lib'))
-
-import yaml
-
 TESTSET_DIR = os.path.join(BASE_PATH, 'woothee', 'testsets')
 
 TARGETS = [