Bump attrs from 20.1.0 to 20.2.0

Bumps [attrs](https://github.com/python-attrs/attrs) from 20.1.0 to 20.2.0.
- [Release notes](https://github.com/python-attrs/attrs/releases)
- [Changelog](https://github.com/python-attrs/attrs/blob/master/CHANGELOG.rst)
- [Commits](python-attrs/attrs@20.1.0...20.2.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

docs-requirements.txt

@@ -6,7 +6,7 @@
 #
 alabaster==0.7.12         # via sphinx
 async-generator==1.10     # via -r docs-requirements.in
-attrs==20.1.0             # via -r docs-requirements.in, outcome
+attrs==20.2.0             # via -r docs-requirements.in, outcome
 babel==2.8.0              # via sphinx
 certifi==2020.6.20        # via requests
 chardet==3.0.4            # via requests

test-requirements.txt

@@ -8,7 +8,7 @@ appdirs==1.4.4            # via black
 astor==0.8.1              # via -r test-requirements.in
 astroid==2.4.2            # via pylint
 async-generator==1.10     # via -r test-requirements.in
-attrs==20.1.0             # via -r test-requirements.in, outcome, pytest
+attrs==20.2.0             # via -r test-requirements.in, outcome, pytest
 backcall==0.2.0           # via ipython
 black==20.8b1 ; implementation_name == "cpython"  # via -r test-requirements.in
 cffi==1.14.2              # via cryptography