Bump version to 5.5.4 in pyproject.toml

Bump version to 5.5.3

Fixed PyCQA#1469: --diff option is ignored when input is from stdin. …

…Release hot fix release 5.5.2

Bump version to 5.5.1

Bump version to 5.5.0

Bump version to 5.4.2

Fix PyCQA#1381: combine_as losing non as imports, in some cases.

Bump version to 5.4.0

Merge branch 'develop' of https://github.com/timothycrosley/isort

Formatting