Update dependencies in requirements.txt

FYI These are the dev dependencies. The pip install dependencies are in
the setup.py file.

Author: Landon Gilbert-Bland

requirements.txt

@@ -1,33 +1,35 @@
-alabaster==0.7.10
+alabaster==0.7.12
 asn1crypto==0.24.0
-Babel==2.5.3
-certifi==2018.4.16
+Babel==2.6.0
+certifi==2018.11.29
 cffi==1.11.5
 chardet==3.0.4
-click==6.7
-cryptography==2.3
+Click==7.0
+cryptography==2.4.2
 docutils==0.14
-Flask==1.0
+filelock==3.0.10
+Flask==1.0.2
 Flask-Sphinx-Themes==1.0.2
-idna==2.6
-imagesize==1.0.0
-itsdangerous==0.24
+idna==2.8
+imagesize==1.1.0
+itsdangerous==1.1.0
 Jinja2==2.10
-MarkupSafe==1.0
-packaging==17.1
-pluggy==0.6.0
-py==1.5.3
-pycparser==2.18
-Pygments==2.2.0
-PyJWT==1.6.1
-pyparsing==2.2.0
-pytz==2018.4
-requests==2.18.4
-six==1.11.0
+MarkupSafe==1.1.0
+packaging==18.0
+pluggy==0.8.0
+py==1.7.0
+pycparser==2.19
+Pygments==2.3.1
+PyJWT==1.7.1
+pyparsing==2.3.0
+pytz==2018.7
+requests==2.21.0
+six==1.12.0
 snowballstemmer==1.2.1
-Sphinx==1.7.4
-sphinxcontrib-websupport==1.0.1
-tox==3.0.0
-urllib3==1.22
-virtualenv==15.2.0
+Sphinx==1.8.3
+sphinxcontrib-websupport==1.1.0
+toml==0.10.0
+tox==3.6.1
+urllib3==1.24.1
+virtualenv==16.2.0
 Werkzeug==0.14.1