Aliases handling improved

• #187 internals - Multi from aliases (by @collerek)
• #188 bug - Query including Distinct not working
• #189 dependencies - build(deps-dev): bump black from 21.6b0 to 21.7b0 (by @dependabot[bot])
• #190 internals - CI - install the latest black version
• #192 dependencies - build(deps-dev): bump pylint from 2.9.3 to 2.9.4 (by @dependabot[bot])
• #193 dependencies - build(deps-dev): bump coveralls from 3.1.0 to 3.2.0 (by @dependabot[bot])
• #194 pr - Fix for Casting values results in incorrect alias reporting (by @collerek)
• #195 dependencies - build(deps-dev): bump pylint from 2.9.5 to 2.9.6 (by @dependabot[bot])
• #203 pr - Ignore case on column alias names from subquery (by @christopherpickering)
• #211 internals - snok/install-poetry - use a default Poetry version
• #216 dependencies - build(deps-dev): bump pylint from 2.9.6 to 2.10.2 (by @dependabot[bot])
• #217 internals - Extract conditions (by @collerek)
• #218 dependencies - build(deps-dev): bump black from 21.7b0 to 21.8b0 (by @dependabot[bot])
• #219 dependencies - build(deps-dev): bump pytest from 6.2.4 to 6.2.5 (by @dependabot[bot])
• #222 pr - Restore fully qualified columns (by @collerek)
• #223 pr - fix recurrent aliases names leading to infinite loop (by @collerek)
• #228 pr - allow redundant parentheses around (sub)queries (by @collerek)
• #229 pr - additional test for cast (by @collerek)
• #230 dependencies - build(deps): bump sqlparse from 0.4.1 to 0.4.2 (by @dependabot[bot])

Welcome, @christopherpickering, as our new contributor 🙂