Bump black from 21.5b2 to 21.6b0 (#94)

Bumps [black](https://github.com/psf/black) from 21.5b2 to 21.6b0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/commits)

---
updated-dependencies:
- dependency-name: black
  dependency-type: direct:development
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

poetry.lock

@@ -30,7 +30,7 @@ tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>
 
 [[package]]
 name = "black"
-version = "21.5b2"
+version = "21.6b0"
 description = "The uncompromising code formatter."
 category = "dev"
 optional = false
@@ -401,7 +401,7 @@ testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "0e448c13886cfea2c6db3e521f277637a5a1010863b3d7ec03235569de95711f"
+content-hash = "918a52afde91a71a58e054d46830500cd2781a562cd7e0718659ee8ede0297fa"
 
 [metadata.files]
 appdirs = [
@@ -417,8 +417,8 @@ attrs = [
     {file = "attrs-20.2.0.tar.gz", hash = "sha256:26b54ddbbb9ee1d34d5d3668dd37d6cf74990ab23c828c2888dccdceee395594"},
 ]
 black = [
-    {file = "black-21.5b2-py3-none-any.whl", hash = "sha256:e5cf21ebdffc7a9b29d73912b6a6a9a4df4ce70220d523c21647da2eae0751ef"},
-    {file = "black-21.5b2.tar.gz", hash = "sha256:1fc0e0a2c8ae7d269dfcf0c60a89afa299664f3e811395d40b1922dff8f854b5"},
+    {file = "black-21.6b0-py3-none-any.whl", hash = "sha256:dfb8c5a069012b2ab1e972e7b908f5fb42b6bbabcba0a788b86dc05067c7d9c7"},
+    {file = "black-21.6b0.tar.gz", hash = "sha256:dc132348a88d103016726fe360cb9ede02cecf99b76e3660ce6c596be132ce04"},
 ]
 bw-sphinxtheme = [
     {file = "bw_sphinxtheme-0.1.8.tar.gz", hash = "sha256:dde9d9003e044367c28a8a63ee0c38fb53306241b71a04abb97a567f2ddefca9"},

pyproject.toml

@@ -34,7 +34,7 @@ python = "^3.7"
 pytest = "^6.2"
 pytest-cov = "^2.12"
 pytest-runner = "^5.3"
-black = { version = "^21.5b2", python = "^3.7" }
+black = { version = "^21.6b0", python = "^3.7" }
 mypy = "0.902"
 pre-commit = "^2.13"
 bw_sphinxtheme = "^0.1.8"