Fix #249: Quoting format is integer, not string.

requirements-dev.txt

@@ -1,10 +1,10 @@
 -e .[dev]
 alabaster==0.7.10
-arrow==0.12.0
+arrow==0.12.1
 attrs==17.4.0
 babel==2.5.3
 binaryornot==0.4.4
-certifi==2017.11.5
+certifi==2018.1.18
 chardet==3.0.4
 click==6.7
 cookiecutter==1.5.1
@@ -23,7 +23,7 @@ pygments==2.2.0
 pytest-cov==2.5.1
 pytest-sugar==0.8.0
 pytest-timeout==1.2.1
-pytest==3.3.2
+pytest==3.4.0
 python-dateutil==2.6.1
 pytz==2017.3
 requests==2.18.4