+- Set `--pyi` mode if `--stdin-filename` ends in `.pyi` (#2169)
+- Add `--no-diff` to black-primer to suppress formatting changes (#2187)
+
+### 21.4b2
+
+#### _Black_
+
+- Fix crash if the user configuration directory is inaccessible. (#2158)
+
+- Clarify
+ [circumstances](https://github.com/psf/black/blob/master/docs/the_black_code_style.md#pragmatism)
+ in which _Black_ may change the AST (#2159)
+
+#### _Packaging_
+
+- Install `primer.json` (used by `black-primer` by default) with black. (#2154)
+
+### 21.4b1
+
+#### _Black_
+
+- Fix crash on docstrings ending with "\ ". (#2142)
+
+- Fix crash when atypical whitespace is cleaned out of dostrings (#2120)
+
+- Reflect the `--skip-magic-trailing-comma` and `--experimental-string-processing` flags
+ in the name of the cache file. Without this fix, changes in these flags would not take
+ effect if the cache had already been populated. (#2131)
+
+- Don't remove necessary parentheses from assignment expression containing assert /
+ return statements. (#2143)
+
+#### _Packaging_
+
+- Bump pathspec to >= 0.8.1 to solve invalid .gitignore exclusion handling
+
+### 21.4b0
+
+#### _Black_
+
+- Fixed a rare but annoying formatting instability created by the combination of
+ optional trailing commas inserted by `Black` and optional parentheses looking at
+ pre-existing "magic" trailing commas. This fixes issue #1629 and all of its many many
+ duplicates. (#2126)
+
+- `Black` now processes one-line docstrings by stripping leading and trailing spaces,
+ and adding a padding space when needed to break up """". (#1740)
+
+- `Black` now cleans up leading non-breaking spaces in comments (#2092)
+