chore(package): update eslint-plugin-jsx-a11y to version 6.2.3

Closes #235

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
     "eslint": "^5.16.0",
     "eslint-config-airbnb": "15.1.0",
     "eslint-plugin-import": "^2.0.0",
-    "eslint-plugin-jsx-a11y": "^5.1.1",
+    "eslint-plugin-jsx-a11y": "^6.2.3",
     "eslint-plugin-react": "^7.3.0",
     "mocha": "^5.2.0",
     "nyc": "^14.0.0",