Fix double attributes bug, change header sizes

• We were applying some attributes twice
• Change header sizes

Update to latest upstream

Nothing changed here except for CI

Fix regression with basic attributes

We were forgetting to pass down some overridden attributes for the components use-case.

Add tabs to list attributes, not only components

0.5.2

Merge pull request #10 from withprimer/gn--fix-lists-for-non-componen…

Make attributes public

Simple release: we've made attributes(with:) public so that we can do some fancy live-editing UIView stuff from outside the library.

Fix headers and add proper indentation to Lists

• Headers and other block containers were not retaining there overridden attributes
• Lists did not use hanging indents (now they do, but only on iOS – macOS can come later if needed)

Fix joining across components

This dramatically changes the output, so I've bumped the minor version.

Fixes for lists

Merge pull request #5 from withprimer/gn--extensions-can-be-nested

Handle container of blocks properly

Fix for extensions without properties

Merge pull request #4 from withprimer/gn--test-prod-example

Fix case where there are no properties

Generic Extension support

Added support for generic extensions as described in the README