Bump requirements.

Author: JulienPalard

requirements.txt

@@ -1,22 +1,21 @@
 alabaster==0.7.10
-Babel==2.4.0
-certifi==2018.1.18
+Babel==2.6.0
+blurb==1.0.6
+certifi==2018.4.16
 chardet==3.0.4
 docutils==0.14
-idna==2.6
+idna==2.7
 imagesize==1.0.0
 Jinja2==2.10
 MarkupSafe==1.0
+packaging==17.1
 Pygments==2.2.0
 pyparsing==2.2.0
+python-docs-theme==2018.2
 pytz==2018.4
-requests==2.18.4
+requests==2.19.1
 six==1.11.0
 snowballstemmer==1.2.1
-Sphinx==1.7.4
-sphinx-rtd-theme==0.3.0
-blurb==1.0.6
-sphinxcontrib-websupport==1.0.1
-typing==3.6.1
-urllib3==1.22
-python-docs-theme==0.0.1
+Sphinx==1.7.5
+sphinxcontrib-websupport==1.1.0
+urllib3==1.23