Bump dataclasses from 0.4 to 0.6

Bumps [dataclasses](https://github.com/ericvsmith/dataclasses) from 0.4 to 0.6.
- [Release notes](https://github.com/ericvsmith/dataclasses/releases)
- [Commits](ericvsmith/dataclasses@0.4...0.6)

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

requirements.txt

@@ -1,4 +1,4 @@
-dataclasses==0.4
+dataclasses==0.6
 tabulate==0.8.2
 click==7.0
 gym==0.10.8