Improved brackets handling + dependencies updated

• #100 internals - Lint after running tests
• #101 dependencies - build(deps-dev): bump pylint from 2.6.2 to 2.7.0 (by @dependabot[bot])
• #102 dependencies - build(deps-dev): bump pylint from 2.7.0 to 2.7.1 (by @dependabot[bot])
• #104 dependencies - build(deps-dev): bump coverage from 5.4 to 5.5 (by @dependabot[bot])
• #108 internals - Use poetry 1.1.5
• #109 internals - CI - store ~/.cache dir + pip install wheel
• #110 internals - actions/cache: invalidate on poetry.lock change
• #113 enhancement - Improved brackets handling
• #116 dependencies - build(deps-dev): bump pytest from 6.2.2 to 6.2.3 (by @dependabot[bot])
• #117 dependencies - snok/install-poetry@v1.1.3
• #118 dependencies - build(deps-dev): bump pylint from 2.7.4 to 2.8.1 (by @dependabot[bot])
• #119 dependencies - build(deps-dev): bump pylint from 2.8.1 to 2.8.2 (by @dependabot[bot])
• #123 dependencies - Upgrade black to 21.4b1
• #124 dependencies - build(deps-dev): bump black from 21.4b1 to 21.4b2 (by @dependabot[bot])