Bump version to 5.9.1 (hotfix)

Author: timothycrosley

CHANGELOG.md

@@ -2,7 +2,10 @@ Changelog
 =========
 
 NOTE: isort follows the [semver](https://semver.org/) versioning standard.
-Find out more about isort's release policy [here](https://pycqa.github.io/isort/docs/major_releases/release_policy/).
+Find out more about isort's release policy [here](https://pycqa.github.io/isort/docs/major_releases/release_policy).
+
+### 5.9.1 June 21st 2021 [hotfix]
+  - Fixed #1758: projects with many files and skip_ignore set can lead to a command-line overload.
 
 ### 5.9.0 June 21st 2021
   - Improved CLI startup time.

isort/_version.py

@@ -1 +1 @@
-__version__ = "5.9.0"
+__version__ = "5.9.1"

pyproject.toml

@@ -3,7 +3,7 @@ line-length = 100
 
 [tool.poetry]
 name = "isort"
-version = "5.9.0"
+version = "5.9.1"
 description = "A Python utility / library to sort Python imports."
 authors = ["Timothy Crosley <[email protected]>"]
 license = "MIT"