Update dependency eslint-plugin-jsx-a11y to ^6.3.0

Signed-off-by: Renovate Bot <bot@renovateapp.com>

Author: renovate-bot

package-lock.json

@@ -51,7 +51,7 @@
     "eslint-config-airbnb": "^18.1.0",
     "eslint-loader": "^2.2.1",
     "eslint-plugin-import": "^2.21.2",
-    "eslint-plugin-jsx-a11y": "^6.2.3",
+    "eslint-plugin-jsx-a11y": "^6.3.0",
     "eslint-plugin-react": "^7.20.0",
     "prop-types": "^15.7.2",
     "webpack-cli": "^3.3.12"