Bump tomlkit from 0.5.3 to 0.5.4 (#110)

Bumps [tomlkit](https://github.com/sdispater/tomlkit) from 0.5.3 to 0.5.4.
- [Release notes](https://github.com/sdispater/tomlkit/releases)
- [Changelog](https://github.com/sdispater/tomlkit/blob/master/CHANGELOG.md)
- [Commits](python-poetry/tomlkit@0.5.3...0.5.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

poetry.lock

@@ -54,7 +54,7 @@ sphinxcontrib-mermaid = "^0.3.1"
 sphinx-typlog-theme = "^0.7.1"
 doc8 = "^0.8.0"
 m2r = "^0.2.1"
-tomlkit = "^0.5.3"
+tomlkit = "^0.5.4"
 
 [build-system]
 requires = ["poetry>=0.12"]