update dependencies (Graylog2#782)

* Bump watchdog from 0.9.0 to 0.10.1

Bumps [watchdog](https://github.com/gorakhargosh/watchdog) from 0.9.0 to 0.10.1.
- [Release notes](https://github.com/gorakhargosh/watchdog/releases)
- [Changelog](https://github.com/gorakhargosh/watchdog/blob/master/changelog.rst)
- [Commits](gorakhargosh/watchdog@v0.9.0...v0.10.1)

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Bump packaging from 19.2 to 20.1

Bumps [packaging](https://github.com/pypa/packaging) from 19.2 to 20.1.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/master/CHANGELOG.rst)
- [Commits](pypa/packaging@19.2...20.1)

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Bump urllib3 from 1.25.7 to 1.25.8

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.7 to 1.25.8.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/master/CHANGES.rst)
- [Commits](urllib3/urllib3@1.25.7...1.25.8)

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Bump six from 1.13.0 to 1.14.0

Bumps [six](https://github.com/benjaminp/six) from 1.13.0 to 1.14.0.
- [Release notes](https://github.com/benjaminp/six/releases)
- [Changelog](https://github.com/benjaminp/six/blob/master/CHANGES)
- [Commits](benjaminp/six@1.13.0...1.14.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Bump docutils from 0.15.2 to 0.16

Bumps [docutils](http://docutils.sourceforge.net/) from 0.15.2 to 0.16.

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Bump pyyaml from 5.2 to 5.3

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.2 to 5.3.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](yaml/pyyaml@5.2...5.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Bump babel from 2.7.0 to 2.8.0

Bumps [babel](https://github.com/python-babel/babel) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/python-babel/babel/releases)
- [Changelog](https://github.com/python-babel/babel/blob/master/CHANGES)
- [Commits](python-babel/babel@v2.7.0...v2.8.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Bump imagesize from 1.1.0 to 1.2.0

Bumps [imagesize](https://github.com/shibukawa/imagesize_py) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/shibukawa/imagesize_py/releases)
- [Commits](https://github.com/shibukawa/imagesize_py/commits)

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Bump pyparsing from 2.4.5 to 2.4.6

Bumps [pyparsing](https://github.com/pyparsing/pyparsing) from 2.4.5 to 2.4.6.
- [Release notes](https://github.com/pyparsing/pyparsing/releases)
- [Changelog](https://github.com/pyparsing/pyparsing/blob/pyparsing_2.4.6/CHANGES)
- [Commits](pyparsing/pyparsing@pyparsing_2.4.5...pyparsing_2.4.6)

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Bump sphinx from 2.3.0 to 2.3.1

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v2.3.0...v2.3.1)

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Bump watchdog from 0.9.0 to 0.10.2

Bumps [watchdog](https://github.com/gorakhargosh/watchdog) from 0.9.0 to 0.10.2.
- [Release notes](https://github.com/gorakhargosh/watchdog/releases)
- [Changelog](https://github.com/gorakhargosh/watchdog/blob/master/changelog.rst)
- [Commits](gorakhargosh/watchdog@v0.9.0...v0.10.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Bump sphinx from 2.3.0 to 2.4.3

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 2.3.0 to 2.4.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/3.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v2.3.0...v2.4.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

requirements.txt

@@ -1,33 +1,33 @@
 alabaster==0.7.12
 argh==0.26.2
-Babel==2.7.0
+Babel==2.8.0
 backports-abc==0.5
 backports.ssl-match-hostname==3.7.0.1
 certifi==2019.11.28
 chardet==3.0.4
-docutils==0.15.2
+docutils==0.16
 futures==3.1.1
 idna==2.8
-imagesize==1.1.0
+imagesize==1.2.0
 Jinja2==2.10.3
 livereload==2.6.1
 MarkupSafe==1.1.1
-packaging==19.2
+packaging==20.1
 pathtools==0.1.2
 port-for==0.3.1
 Pygments==2.5.2
-pyparsing==2.4.5
+pyparsing==2.4.6
 pytz==2019.3
-PyYAML==5.2
+PyYAML==5.3
 requests==2.22.0
 singledispatch==3.4.0.3
-six==1.13.0
+six==1.14.0
 snowballstemmer==2.0.0
-Sphinx==2.3.0
+Sphinx==2.4.3
 sphinx-autobuild==0.7.1
 sphinx-rtd-theme==0.4.3
 sphinxcontrib-websupport==1.1.2
 tornado==5.1.1
 typing==3.7.4
-urllib3==1.25.7
-watchdog==0.9.0
+urllib3==1.25.8
+watchdog==0.10.2