[Dev Deps] update `eslint-plugin-jsx-a11y`, `sinon`

.eslintrc

@@ -25,6 +25,8 @@
     "no-restricted-imports": 0, // TODO: enable with full RTL support
 
     "react/jsx-one-expression-per-line": 1, // TODO: enable once fixed upstream
+
+    "jsx-a11y/aria-proptypes": 1, // TODO: https://github.com/evcohen/eslint-plugin-jsx-a11y/issues/454
   },
 
   "settings": {

package.json

@@ -77,7 +77,7 @@
     "eslint": "^4.19.1",
     "eslint-config-airbnb": "^17.0.0",
     "eslint-plugin-import": "^2.13.0",
-    "eslint-plugin-jsx-a11y": "^6.0.3",
+    "eslint-plugin-jsx-a11y": "^6.1.0",
     "eslint-plugin-react": "^7.10.0",
     "eslint-plugin-react-with-styles": "^2.0.0",
     "git-directory-deploy": "^1.5.1",
@@ -104,7 +104,7 @@
     "rimraf": "^2.6.2",
     "safe-publish-latest": "^1.1.1",
     "sass-loader": "^7.0.3",
-    "sinon": "^6.0.1",
+    "sinon": "^6.1.0",
     "sinon-sandbox": "^1.0.2",
     "style-loader": "^0.20.3",
     "webpack": "^2.6.1"