fix test

Author: alingse

.travis.yml

@@ -5,6 +5,7 @@ python:
     - "2.7"
     - "3.5"
     - "3.6"
+    - "3.7"
 install:
     - pip install .
     - pip install flake8

tests/test_mkexcel.py

@@ -55,7 +55,7 @@ def test_dumpcexcel_xls(self):
 
     def test_dump_csv_with_non_ascii(self):
         fin = open('./fixture/files/expand.2.json', 'r')
-        fout = open('./fixture/files/tmp.output.2.csv', 'wb')
+        fout = open('./fixture/files/tmp.output.2.csv', 'w')
 
         dump_excel(fin, fout, DumpCSV)