Merge pull request #435 from Shopify/release-v6.0.0

Release version 6.0.0

Merge pull request #420 from Shopify/v5.11.0

Release 5.11.0

Merge pull request #406 from Shopify/release_v5.10.0

Preparing for release 5.10.0

Merge pull request #395 from Shopify/v_5_9_0

Preparing for release v5.9.0

Merge pull request #388 from Shopify/v5_8_1

Preparing for release 5.8.1

Merge pull request #382 from Shopify/v5_8_0

preparing for release v5.8.0

Merge pull request #378 from Shopify/v5_7_0

Preparing for release v5.7.0

Merge pull request #355 from Shopify/v5_6_0

Preparing for release v5.6.0

Merge pull request #346 from Shopify/release-5-5-1

Preparing for v5.5.1 release

Release version 5.5.0