Update changelog

CHANGELOG.md

@@ -6,7 +6,10 @@ Find out more about isort's release policy [here](https://pycqa.github.io/isort/
 
 ### 5.7.0 TBD
   - Implemented #1596: Provide ways for extension formatting and file paths to be specified when using streaming input from CLI.
-  - Implemented #1583: Ability to output and diff within a single API call to isort.file.
+  - Implemented #1583: Ability to output and diff within a single API call to `isort.file`.
+  - Implemented #1562, #1592 & #1593: Better more useful fatal error messages.
+  - Implemented #1575: Support for automatically fixing mixed indentation of import sections.
+  - Implemented #1582: Added a CLI option for skipping symlinks.
 
 ### 5.6.4 October 12, 2020
   - Fixed #1556: Empty line added between imports that should be skipped.