update black version in pre-commit

As inidicated in psf/black#420 the mutable tag is not appropriate, so we change to pin a fixed version tag. Additionally, we remove the black version dependency from blacken-docs, and add blacken-docs to the requirements-dev.txt file.
widdowquinn · May 27, 2021 · 2ddcf26 · 2ddcf26
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diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
@@ -1,14 +1,14 @@
 repos:
 -   repo: https://github.com/psf/black
-    rev: stable
+    rev: 21.5b1
     hooks:
     - id: black
       language_version: python3
 -   repo: https://github.com/asottile/blacken-docs
-    rev: v0.3.0
+    rev: v1.10.0
     hooks:
     -   id: blacken-docs
-        additional_dependencies: [black==18.9b0]
+        additional_dependencies: [black]
 -   repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v1.2.3
     hooks:

diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -1,5 +1,6 @@
 bandit
 black
+blacken-docs
 codecov
 coverage
 doc8