Update requirements.

requirements-dev.txt

@@ -1,4 +1,5 @@
 -e .[dev]
+-r requirements.txt
 alabaster==0.7.10
 arrow==0.12.1
 attrs==17.4.0
@@ -8,31 +9,32 @@ certifi==2018.1.18
 chardet==3.0.4
 click==6.7
 cookiecutter==1.5.1
-coverage==4.4.2
+coverage==4.5.1
 docutils==0.14
 future==0.16.0
 idna==2.6
-imagesize==0.7.1
+imagesize==1.0.0
 jinja2-time==0.2.0
 jinja2==2.10
 markupsafe==1.0
+more-itertools==4.1.0
+packaging==17.1
 pluggy==0.6.0
 poyo==0.4.1
-py==1.5.2
+py==1.5.3
 pygments==2.2.0
+pyparsing==2.2.0
 pytest-cov==2.5.1
-pytest-sugar==0.8.0
 pytest-timeout==1.2.1
-pytest==3.4.0
-python-dateutil==2.6.1
-pytz==2017.3
+pytest==3.5.0
+python-dateutil==2.7.2
+pytz==2018.3
 requests==2.18.4
 six==1.11.0
 snowballstemmer==1.2.1
 sphinx-sitemap==0.2
-sphinx==1.6.6
+sphinx==1.7.2
 sphinxcontrib-websupport==1.0.1
-termcolor==1.1.0
 urllib3==1.22
 whichcraft==0.4.1
-yapf==0.20.1
+yapf==0.21.0