chore(package): update eslint-plugin-jsx-a11y to version 6.0.0

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "eslint": "^4.0.0",
     "eslint-config-airbnb": "^15.0.1",
     "eslint-plugin-import": "^2.3.0",
-    "eslint-plugin-jsx-a11y": "^5.0.3",
+    "eslint-plugin-jsx-a11y": "^6.0.0",
     "eslint-plugin-react": "^7.0.1",
     "isomorphic-fetch": "^2.2.1",
     "jest": "^20.0.1",