feat: upgrade to axe-core 3.0.0-alpha.9 (#46)

* feat: upgrade to axe-core 3.0.0-alpha.8

* feat: add iframe shadow test

* Sniff for shadow-dom in tests

* chore: fix conflicts, remove missing rule

* chore: update to axe-core@3.0.0-alpha.9

* test: extend script timeout

Author: marcysutton

CHANGELOG.md

@@ -1,3 +1,12 @@
+<a name="2.0.0-alpha.1"></a>
+## [2.0.0-alpha.1](https://github.com/dequelabs/axe-webdriverjs/compare/v1.3.0...v2.0.0-alpha.1) (2018-1-18)
+
+
+### Features
+
+* Add axe-core 3.0.0-alpha.9, including Shadow DOM
+
+
 <a name="1.3.0"></a>
 ## [1.3.0](https://github.com/dequelabs/axe-webdriverjs/compare/v1.2.1...v1.3.0) (2018-1-18)