Merge pull request #48 from Sage/build-bump-v2.1.9

Bump version 2.1.9

Merge pull request #46 from Sage/fix_redlock_compat

Fix script manager lock key

Merge pull request #45 from Sage/v2.1.7

Bump version since there was already a 2.1.6

Merge pull request #43 from Sage/ci-replace-travis

Migrate CI to Github Actions

Merge pull request #42 from Sage/FOX-2594

FOX-2594: Remove LIMIT clause for `index_exists?`

Merge pull request #40 from Sage/mutex

Use a mutex when checking out and checking in connections

Merge pull request #39 from Sage/execute-free-result

Ensure result.free is called when calling #execute

Merge pull request #38 from Sage/build-skip-nil-validation

allow nil condition values for backward compatibility

Merge pull request #37 from Sage/check_in_nil

Handle nil client parameter in #check_in

Merge pull request #36 from Sage/release-v2_1_0

Bump version to 2.1.0