Bump the docs requirements.

Author: Julian

docs/requirements.txt

@@ -2,35 +2,35 @@
 # This file is autogenerated by pip-compile
 # To update, run:
 #
-#    pip-compile docs/requirements.in
+#    pip-compile
 #
 alabaster==0.7.12         # via sphinx
 babel==2.8.0              # via sphinx
-certifi==2019.11.28       # via requests
+certifi==2020.4.5.1       # via requests
 chardet==3.0.4            # via requests
-docutils==0.15.2          # via sphinx
-idna==2.8                 # via requests
+docutils==0.16            # via sphinx
+idna==2.9                 # via requests
 imagesize==1.2.0          # via sphinx
-jinja2==2.10.3            # via sphinx
-lxml==4.4.2
+jinja2==2.11.2            # via sphinx
+lxml==4.5.0               # via -r requirements.in
 markupsafe==1.1.1         # via jinja2
-packaging==20.0           # via sphinx
-pyenchant==2.0.0          # via sphinxcontrib-spelling
-pygments==2.5.2           # via sphinx
-pyparsing==2.4.6          # via packaging
-pytz==2019.3              # via babel
-requests==2.22.0          # via sphinx
-six==1.13.0               # via packaging, sphinxcontrib-spelling
+packaging==20.3           # via sphinx
+pyenchant==3.0.1          # via sphinxcontrib-spelling
+pygments==2.6.1           # via sphinx
+pyparsing==2.4.7          # via packaging
+pytz==2020.1              # via babel
+requests==2.23.0          # via sphinx
+six==1.14.0               # via packaging, sphinxcontrib-spelling
 snowballstemmer==2.0.0    # via sphinx
-sphinx==2.3.1
-sphinxcontrib-applehelp==1.0.1  # via sphinx
-sphinxcontrib-devhelp==1.0.1  # via sphinx
-sphinxcontrib-htmlhelp==1.0.2  # via sphinx
+sphinx==3.0.3             # via -r requirements.in, sphinxcontrib-spelling
+sphinxcontrib-applehelp==1.0.2  # via sphinx
+sphinxcontrib-devhelp==1.0.2  # via sphinx
+sphinxcontrib-htmlhelp==1.0.3  # via sphinx
 sphinxcontrib-jsmath==1.0.1  # via sphinx
-sphinxcontrib-qthelp==1.0.2  # via sphinx
-sphinxcontrib-serializinghtml==1.1.3  # via sphinx
-sphinxcontrib-spelling==4.3.0
-urllib3==1.25.7           # via requests
+sphinxcontrib-qthelp==1.0.3  # via sphinx
+sphinxcontrib-serializinghtml==1.1.4  # via sphinx
+sphinxcontrib-spelling==5.0.0  # via -r requirements.in
+urllib3==1.25.9           # via requests
 
 # The following packages are considered to be unsafe in a requirements file:
 # setuptools