[Dev Deps] pin farther back

Author: ljharb

package.json

@@ -49,7 +49,7 @@
     "auto-changelog": "^2.5.0",
     "babel-plugin-add-module-exports": "^1.0.4",
     "babel-preset-airbnb": "^5.0.0",
-    "baseline-browser-mapping": "=2.6.1",
+    "baseline-browser-mapping": "=2.5.9",
     "eslint": "^3 || ^4 || ^5 || ^6 || ^7 || ^8 || ^9",
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-doc-generator": "^1.7.1",