[Dev Deps] pin find-babel-config to v1.2.0, due to a breaking change in v1.2.1

See tleunen/find-babel-config#70 (comment)

Author: ljharb

package.json

@@ -82,6 +82,7 @@
     "eslint-plugin-eslint-plugin": "^2.3.0",
     "eslint-plugin-import": "2.x",
     "eslint-plugin-json": "^2.1.2",
+    "find-babel-config": "=1.2.0",
     "fs-copy-file-sync": "^1.1.1",
     "glob": "^7.2.3",
     "in-publish": "^2.0.1",