CHANGELOG update for v6.4.0

[jessebeach]

This is a release of fix that have been piling up. I think it's a minor release because of the dependency updates, but there's always a good chance that I just don't grok semver :)

- 83e4ff2 [Deps] update `axe-core`, `jsx-ast-utils`
- eb92b07 [Dev Deps] update `@babel/cli`, `@babel/core`, `@babel/plugin-transform-flow-strip-types`, `eslint-plugin-flowtype`, `eslint-plugin-import`, `estraverse`, `expect`, `object.assign`
- 3d98d7a [Deps] update `@babel/runtime`, `axe-core`
- f702f62 [readme] add Spanish translation
- c2ae092 [Docs] `no-static-element-interactions`: Fixed rule name in comments
- b90e20d Fix screenreader -> screen reader
- 645900a Fixed rule name in comments
- 381b9d6 [fix:634] Ignore control elements that are hidden
- 2c47f0a [Fix] `autocomplete-valid`: workaround for axe not being able to handle `null`
- 00bd6d8 Add failing test for autocomplete with dynamic type
- 3c49c9a Add WCAG guidelines to rule documentation
- 4ecaf35 Add a testcase for tablist to interactive supports focus
- dac6864 Deprecate the accessible-emoji rule
- 5191053 Update to axobject-query@2.2.0
- b315698 Allow negative tabindex in aria-activedescendant-has-tabindex
- 8e6fcd0 docs: fix travis badge now points to correct location at travis-ci.com
- 2234df7 Account for additional control elements in label-has-associated-control
- 5cbb718 Adding test cases for label tests
- 66c425c Additional test case for no-redundant-roles

[ljharb]

LGTM! this should be on the same sha as the package.json bump, which is tagged and ff-merged to master.

[ljharb]

Suggested change

	6.4.0 / 2020-10-12
	6.4.0 / 2020-10-12
	==================

[ljharb]

LGTM assuming that the list has been updated to include anything added to master since this PR was created.

[jessebeach]

LGTM assuming that the list has been updated to include anything added to master since this PR was created.

git log --oneline v6.3.1..origin/master

The top and bottom commits are the same as the CHANGELOG (I remove the merge commits to reduce noise).